If I had both and either would fit (shifter didn't hit dash and engine didn't hit firewall) I'd choose the AA Bellhousing.
I run the marks and it has lots of parts and isn't super easy to service. The clutch is kinda buried in there. Also I had a vibration issue due to the spud shaft not engaging into the pilot bearing all the way that it took me 50k miles to figure out.
Otherwise it si nice because the tranny/t case dont move, but that is really the least of your concerns when doing a swap at least IMHOP.