ESXi (free) vs KVM - which is better?

Question

VMware

Who-thread can clearly and briefly say - why is ESXi better than KVM?
For functionality, not beauty.
Well, there - the overhead is an order of magnitude smaller or the distribution of host resources is thinner.
Both have muzzles, and both are linux (well, if figuratively).
I didn’t work with ESXi myself (I only helped to dig deeper), I have only KVM on hand, so I don’t understand why such a hype around this ESXi of yours.

Answer 1

Enterprise - there is such a word. This is when the cost of a license is secondary, and opportunities are primary.
ESXi - This is about tens and hundreds of VMs. It's about dozens of hosts. This is about auto load balancing on hosts with automatic migration between them. This is about "live migration", when the machine is transferred from host to host and works at that time! (In fact, I moved the machine with vCenter in this way :) - that is, the Munchausen principle "out of the swamp by the hair"). It's about sharing access to this entire collective farm with such non-epic granularity that sometimes you think - well, what the heck?
This is about backups in blocks with CBT (Nakivo, using its own tracing logic and also CBT, puts so many backups in 10Tb that without all this they would take 50Tb)

Answer 2

Vari traditionally better deals with iron, better support. Parting iron.

Answer 3

kvm did not yuzat, but for esxi I can tell. It's stable, it works. There are 2 esxi hosts on colocation. They have a number of virtual machines of a large portal with a banner roll, mailing lists and personal accounts.
Questions that you will encounter in esxi
1. Shutdown due to power failure
2. Backup
And so, yes. Works great