Benchmarks are great to look at, to give a consumer a general idea about a piece of software. And while VMWare is faster, in a real world setting those differences would not be noticed. The site notes some of the limitations in emulation as related to VMWare with its video emulation. What it fails to mention is that neither piece of software handles 3D graphics, so if you are looking for a way to preserve the memory of those old MS-Dos games on your glow in the dark XP machine, you will have some limits as to what software will run well in the emulated mode. Microsoft offers a 45-day trial on VPC.
As TDreamer noted you can run non-windows OS's on VMWare, well actually you can run any PC OS you want with either piece of software, since all the software does is emulate a PC. I have VPC running Mandrake on it.
The Biggest consideration to most consumers would be cost. VMWare runs between $299-$329 depending on distribution. VPC costs $129. Before it was bought out from Connectix by Microsoft, It was I believe $229. Hands down VMWare is faster, but I agree with the tester that the better value would be VPC.
