I've had a lot of success tracking drums with an iPad Mini 2, an Apogee Quartet and the Auria recording app. It’s basically as seamless as it gets. You plug in your mics, run the Quartet into the iPad, load up your input matrix in Auria and then hit record.
Now, this is just my opinion, but, four microphones is more than sufficient to get an amazing drum sound. You need a nice sounding room, a couple of good mics placed in the right spots and superb drumming touch/technique. Unless you really know what you are doing, more mics usually means more problems. (ie - phase issues and signal cancelling).
If you're going the iPad recording route, I'd stick with an Apogee Duet or Quartet. Those devices even charge your iPad while recording, so your battery should never cut out mid-take. Their preamps and AD converters are amazing for the money. Pick up a nice pair of condensers or ribbon mics to use as room/OH mics, then add in a decent kick mic and possibly a snare mic like an SM57. Or, scrap the snare mic and go for a mono overhead and stereo room mics, or vice/versa. In any case, learn how to get a good drum track with 2-4 microphones. Experiment with mic placement and even kit placement within your room. By far the biggest contributor to your drum sound will be a great sounding acoustic kit played by a drummer with proper studio touch and technique. For example – tracking live on the floor, you will need to balance the drum sound with the cymbal volume. Its usually far better to slam the drums and back off on the hi hats/cymbals. Your compressors will reward you later.