I mainly use a sf Fender deluxe reverb and just scored a 1970 super reverb. For years I have used a Boss blues driver for low gain and an 80's Keeley modded TS-9 for a bit higher gain. Would I like a FUlldrive better? Would it be a bit of a smoother sound? Also, it seems like their are many versions of the Fulldrive. WHich is best?