Full Tilt Rakeback vs. Pokerstars FPP Progam. What is better?

[niteswmer]

I can't imagine this question hasn't been asked before, but I had no luck doing several searches. If this has been posted, a link would be appreciated.

To maximize return in terms of $, is it better to play on Pokerstars and earn FPPs or is it better to play on FTP and earn 27% rakeback? Is there some quick math I could do to figure that out?

For frame of reference, I play 50-100NL FR and get about 30-50K hands in per month. Does it make a difference if I were to play 100-200NL FR?

Thanks in advance for help/advice.