I use RMIV when I'm doing an electronic track and I'm looking for the right 808 or 909 feel. I use BFD when I'm 'playing' the drums for a track using my midi keyboard. It has a great set of accents/flams/etc. and the 'mic' settings are intuitive and can be used to great effect. I use Jamstix when I'm lazy - though it can be cantankerous as well (Try to do reggae with it), and lastly, I will use loops when I already have a song structure figured out in my head and I simply want to get the songwriting over with and fleshed out, and flushed out of my head. Each has it's purpose.