Army of Darkness plays on TV all the time, because it is a pretty easy film to edit for content. Evil Dead II however is so over the top violent (we are talking Monty Python style blood splirts, not anything realistic) that most TV stations wouldn't be able to play it during waking hour without having to edit it down to a ten minute runtime, if they even managed to make it that long.
I think Evil Dead II is a far funnier film than Army of Darkness. If you liked Army of Darkness in the least, then Evil Dead II is definitely worth a netflix rental. Grab AOD while you are at it, and watch them back to back. They fit together seamlessly like one long movie. Then make a point to rewatch them both with the commentary on (note: only the director's cut of AOD has the commentary. I like the director's cut ending far better than the S-Mart ending, but unfortunately all the director's cut DVD transfers are pretty crappy).