monleo2014
I prefer to go the 18 mono tracks way. Using the stereo route, you end up with two kit pieces on one track. For example - Kick on track one left channel, with Snare on same track right channel. I like each kit piece on it's own track allowing easier further processing.
Thanks Sir William. Isn't it possible to add one additional stereo track to separate kick and snare?
You'll find that going the stereo route, in addition to the Kick/Snare pairing, the toms, hi-hat etc all end up as one side of a stereo track. Much better to go mono. The individual kit piece outputs from AD2 are routed perfectly if you do this.
Also, please do check out Andrew Byrne's videos - they are very informative - although you may have a little trouble with his lovely Irish accent ;)
MidiBoy also has a great tip there too.