I prefer the Rat because it can more easily create 60s fuzzy sounds. If that is something in which you are interested, then you might want to lean in that direction. That said, they are both good pedals imho.

el del

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hollowbodies: 1960s kent americana - 1960s truetone speed-demon
solidbodies: 1996 fender standard james burton tele - 2005/6 squier deluxe trans strat
---> rat 2 + rat 2 + deluxe memory man + c.bread semaphore + e13 soda meiser + zvex lo-fi loop junky
OR (noisy, not true bypass at all) ---> 70s morley power fuzz wah + dod 490 phasor
---> randall commander 210 - epiphone valve junior - univox minimax u4100: 1x15

THE FALL: totally wired ++ THE FALL: big new prinz ++ THE FALL: bombast/crusiers creek
DEVO ++ THE DIRTBOMBS ++ THE KING BROTHERS