I have tried both ways. Two bass drums sounded great as there is seperation between the drums and you can tune them differently which to me is better than two sounding the same. I found them a pain to cart about and took up too much stage space, and too much time setting up around them.
Double kick pedal (DW)for some reason i couldn't get the left kick adjustment quite right, but it also was a pain to set up and cart about.
Many gigs don't allow opportunity to fiddle about at set up, in fact i prefer playing on a 4 piece basic set up, it helps me to not get too busy in my playing, and i am a lazy b***d when it comes to moving gear
Rather just play.
Double kick in the right song does sound great but both ways had limited use for the gigs i was doing and in the end i reverted back to single foot again. Inspired by Ian Paice and John Bonham, both wicked single kick players i worked on pedal technique,speed and endurance and now can play adequately for the type of playing i do. I like to leave bass players thinking "how'd he do that!"
Though nothing ventured nothing gained. By learning double kick basics my hi hat foot improved heaps, as well as my kick foot and realisation much more work was need there too.
I found Colin Bailey book Bass Drum control book is helpful.
For double kickers (or any drummer in fact) Tiger Bill Meligarie's "Double Drumming" is also a good book.
A video i have (remember them) of Tommy Alridge, is worth a look for double kickers.
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