I have the BDS 3" with the upgraded gas shocks and 35's (on a 2 door). I went with BDS based on the waranty and price. Can't say anything but good things about it. Don't know anything about the Superlift.
Not certain about the driveshaft issue with 4" of lift - keep that in mind. If I went with 4" on my 2 door, I would have had to go with new shafts.
I have the Superlift 4" and for the price it's a great lift. I've done some upgrading though, swapped out the cam bolts for the Rockrunner fron lowers (coincedently, it's in the shop today to get the rest done).
I did replace my front drive shaft, the auto with a lift causes the boot to tear.
I'm happy with mine, my only regret is i didn't get a lift I could upgrade and go bigger on ie Teraflex
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