I mainly use 12 and 15 toms, because I like the tonal spread. The 15 is just a bit meatier than a 14, but not as tubby as a 16, and I find it easy to dial those two sizes a pleasant interval apart. For bass, I go back and forth between a 16 (tom conversion) and a 22. The 16 is obviously easier packing in/out, but it also has a tone that really works for the music I play and the small venues I (used to) play. But for outdoor gigs, or any time I want more deep rumble, I bring the 22. I have my toms and cymbals mounted in a way that makes it easy to swap bass drums.