The 2" requires more work and modifications as you can generally squeek by with minimal mods when doing a 1". You don't a need 1" motor mount lift, you can adjust the fan shroud down. Watch AC line clearance, more so with the 2".
You can usually get by without doing anything to the transfer case lever. It's mounted to both the body and the transfer case, so a body lift puts the linkage in a bind. It usually isn't too bad with a 1", but 2" will need modifications or a bracket installed to the body side of the linkage.
I woudn't use anything over 1".