Originally Posted by Dysanfel
Performance wise there is little difference. Choose the one that best suits what you do.
There are important differences. The MBP has a better bus and is more efficient and handling multiple tasks. Additionally, the video card in the MBP has its own processor, so you won't be sapping from your ram when using an additional monitor, although I believe the new video card in the most recent MacBook updates makes this less of an issue. I think the best solution would be this (also what I am planning on doing)
1) Buy the 2.2 MacBook with 1 gig ram
2) Go to MacSales and buy 4gigs for the MacBook for $150 instead of $850 through Apple
3) Use the $1000 you saved to build yourself a quadcore DAW for home use, and use the macbook as a portable unit with the quad DAW as your main mixing machine. I think that is the most convenient and efficient use of your $$$.