Amplifier vs. powered speaker

Looking for some advice on amplification. Small venue gigging with a couple of guitars and occasionally keyboard. I typically use 3 Sennheiser 604 mics that run through a small mixer and into the PA head. We are looking to simplify and not use the PA but go straight to an individual amps - the guitar guys like that. So I am looking at running the mixer into either an amplifier or powered speaker. From what I can read, there seems to be arguments on both sides. Anybody have any advice on what you may have found works good and what make you like. Thanks in advance.