Look Ma, no RealTracks.
Yes midi is more flexible.
I find EZDrummer 2 great for getting the drums just how you need them.
RapidComposer is exactly that, will fit any midi anywhere on the chord track to any chord/scale.
MusicLab RealGuitars, I just upgraded to RealRick 4 with a chord track and lots of humanize features. You can feed the midi out to any Kontakt instrument, other vsti or just DI out to Amplitube.

These combine with the PG apps is all I need.