Kaspersky vs Bitdefender vs ESET for Business Endpoints

The question we actually get

"Our Kaspersky renewal is due. A supplier told us to switch to Bitdefender, someone else said ESET is lighter on old PCs, and the quote now has a line called EDR. What is EDR, and which one should a company with forty old Windows PCs choose?"

Short answer on EDR: classic antivirus checks files against what it already knows is bad. EDR (Endpoint Detection and Response) records what happens on each PC, such as processes, network connections and logons, flags suspicious chains of events and lets an administrator isolate a machine remotely. XDR extends the same idea to email, servers, identity and cloud signals in one console. The full explanation is in antivirus vs EDR. The point for buying: EDR only helps if someone reads its alerts.

All three vendors here make good protection. Independent lab results put them close to each other year after year, so detection rate is rarely what separates them in a Lao office. Console, update method, old hardware and who will watch the alerts decide it.

The three side by side

Console: cloud or on-prem

A cloud console means no server to maintain. Laptops that go to provincial sites or home still report in and receive policy over the internet. For a 20-PC office with no server room, cloud is almost always the right choice.

An on-prem console makes sense when the network is closed or the internet link is weak: mine sites, factories with OT networks, offices where management does not want security data leaving the building. The price is a server you must patch, back up and power through the 17:00–19:00 brownouts. All three offer both models, with Kaspersky's on-prem server the most mature of the three and ESET and Bitdefender leaning more towards cloud.

Old PCs: Windows 7 and Windows 10

Many Lao offices still run Windows 10, and some still have Windows 7 machines connected to a printer, a time-attendance reader or old accounting software. Facts first: Microsoft stopped security updates for Windows 7 in January 2020 and ended standard Windows 10 support on 14 October 2025.

Endpoint protection cannot fix an unpatched operating system. It can block a lot, but an attacker exploiting an OS flaw that will never be patched has an easier day. Vendor support for old Windows also shrinks over time, and EDR features usually need newer Windows than basic antivirus. Check each vendor's current support matrix for your exact Windows version before buying, not after.

On footprint: on a PC with 4 GB of RAM and a spinning hard disk, a heavy agent plus a full scan during working hours makes the machine feel broken. ESET has the best reputation here, but all three can be tuned: schedule full scans at lunch or after hours, and switch off modules you do not use. The real fix for a 4 GB machine with a hard disk is an SSD and an upgrade plan.

Offline and air-gapped updates

Mine camps, some factories and remote sites have slow, expensive or no internet. Signature updates are small and frequent; agent upgrades are large and occasional. The design that works is one local machine that downloads once and serves every PC on the LAN.

• Kaspersky: the on-prem Security Center acts as the update source, and update agents can serve each site. For fully offline networks, updates are carried in on approved media.
• Bitdefender: endpoints given the relay role cache updates and installation packages for their site.
• ESET: a caching proxy serves updates on the LAN, and a mirror tool prepares updates for networks with no internet at all.

If you carry updates in on USB, use a dedicated, scanned drive and a written routine. Otherwise the offline network drifts weeks behind without anyone noticing.

20 PCs vs 200 PCs

The numbers change the design more than the brand does. A worked example on bandwidth: say a new agent version is a 150 MB package.

• 20 PCs each downloading it directly: 20 × 150 MB = 3,000 MB, about 3 GB. On a normal office fibre line that is fine.
• 200 PCs at a site each downloading it: 200 × 150 MB = 30,000 MB, about 30 GB through one line. Through one local relay or cache: 150 MB comes in once and the rest stays on the LAN.

At 20 PCs: cloud console, the vendor's standard business tier, automatic updates, one person who gets the alert emails. EDR is worth it only if that person, or a managed service, will look at alerts every day.

At 200 PCs: groups and policies per department and site, a local relay or cache at every site with a weak link, EDR on servers and admin PCs at minimum, and someone who triages alerts daily. This is where SOC monitoring or the vendor's managed detection service starts to make sense, because nobody watches 200 endpoints well in their spare time.

Check your own vendor policy

Some buyers cannot use certain vendors because of their parent company's policy, a partner's requirements, a funder's rules or an insurer's questionnaire. This affects Kaspersky more often than the other two. We do not make that decision for you: check your own company and vendor policy, and ask your head office or main partners before you buy, not after rollout. On language, check whether the console and the user-facing messages exist in the languages your staff read before you commit; do not assume.

Which one we would pick for

• Small office, 10 to 30 mostly older PCs, one IT person: ESET, for the light agent and simple cloud console.
• Growing SME, 50 to 200 PCs, plans to add EDR: Bitdefender, for clear steps from protection to EDR and a managed option later.
• Closed network at a mine or factory, little or no internet: Kaspersky, for its mature on-prem server and offline update tools, if your company and partner policies allow it. Otherwise ESET or Bitdefender with an on-prem console.
• Hotel with front desk, back office and a few servers: any of the three; spend the effort on separating guest Wi-Fi from staff PCs and on email security, since many infections at hotels arrive by email.
• Company already on Kaspersky with no policy issue: renew, but turn on the modules you are paying for and check that every PC actually reports to the console.

Whichever you choose, pair it with patching, backups and staff training. EDR catches what gets through; it does not replace those.

Next step

Send us on WhatsApp a screenshot of your current antivirus console (product, number of devices, expiry date) and a rough count of PCs by Windows version. We will tell you which machines need attention first and which of the three fits your network, including the offline-update design if a site has weak internet. See endpoint protection and EDR for how we deploy it.