What is the difference between them. I have never really played through a RAT. I play mostly Mexican Rock along with some Funk and a couple of country standards. I have a BB preamp, Zendrive, OCD Ver 4 and an AC booster on the way. Any opinions would help. Thanks
I have a Keeley Rat and keep it on the "Phat Rat" setting. The tone is smoother and fatter on that setting. I haven't played a Power Screamer but do have a couple of TS based pedals. Rats and tube screamers are different animals but compliment each other very well.
My Keeley Rat is my main rhythm pedal... I wouldn't call it fuzzy (in a respectable amount of gain... cranked, it will fuzz up), but I also wouldn't call it "warm." I leave it in Fat Rat mode, and I find it useful through most of its gain range.
I have tried to replace this pedal more than once, and nothing has been able to do what the Rat does for me.
If you've never played through a Rat you should just find one at a local store to play through first and see if that's generally the sound you're after. I've played through a Keeley but don't have one-I have a Rat 2 and Vintage Rat. The Rat 2 (Lm308) is my favorite pedal through my Jcm800-it really adds a certain bite that other pedals don't. Apples and oranges with a tube screamer type pedal though. The Rat has a certain nasally quality due to the filter control. I don't know what kind of match it would be for your musical stylel though.