I can't pretend to have the slightest explanation why, but I play better using hardware emulation, even if in certain cases the sound is actually weaker and/or as hard to get to sit in the mix.
I remember at one point in Russia last winter when I started to feel totally depressed about my playing. I mean, I always knew I was no Steve Vai, but I could play.
When we got back home and I tried to re-record some stuff using my old POD 2, it was quite a relief to hear that I hadn't just lost it all. One thing that helped w/ software is the addition of the hardware compressor in the signal chain. It helps tightening up that signal a bit.