Comment No compitition (Score 2, Informative) 627
I've used Connectix and VMWare and VMWare kicks connectix's butt. I think Connectix uses a CPU level emulation to run, where VMWare uses a vitual machine. In short VMware run about 95% the speed of the host CPU while Connectix was running less the 50%.
I could be different these days. Does anyone have any up-to-date performance information??
VMWare Rules! (Plus it runs on Linux)