Quite frankly if the setup is the same on both, ie, Ram, sound card, etc. then it just becomes personal preference. I have my recording setup on both my laptop and my desktop. I prefer the laptop because of the mobility. I can record on the deck in the sunshine, in the garage, basement or take it to a jam session. When I travel I can edit the songs.

The only difference between a laptop and desktop would be the expandability of memory, ram etc. I believe the largest hard drive available for a laptop right now is 160gb, my desktop has over 600gb in it. However, with that said the standard in a quality laptop today is 100gb which should be MORE than enough for recording.