I work for an ISP and can put as many machines in our datacenters as I want (within reason, of course) so I only have a few (small) VPSes nowadays. When I used to have a bunch of them, however, I quickly learned to avoid anything OpenVZ-based like the plague.

This is anecdotal, of course, but OpenVZ "feels" very much inferior and the providers running OpenVZ (more often than not) very much seemed like fly-by-night operations simply trying to squeeze as many VMs as possible onto a physical host without any regard to performance.