What fish do you have or are you stocking.... Common answer would be... Big fish eats allot produces lots of waste like... Oscar,GT's, or a overpopulated tank.... Wet dry is going to be the way to go and I don';t have one yet .. But am about to build one... For my 55..
Like they said less work in the long run, eaasier maintinance.... More water flow happier fish... But don't take my word for it as I'm just blowin smoke as I have yet to experience a wet dry yet... but I've been reading and talkin with the lfs staff.. Plus they just flat out look fun to make!!