Add-a-leafs are nice but a pain in the ass to install. Blocks simply go under your rear springs and call it good after installing new and longer u-bolts.
Like many have said axle wrap is common if you are actually wheeling the truck but if it is mostly a street queen then you'll be fine with blocks.
Pulling the leafs apart is a pain because you have to clamp the crap out of it and then be able to slowly release the spring pack to install the new add-a-leafs and then put it back together. Would be much easier with a compressor but by hand it's just stupid. Ask me how I know
I've wheeled lots of rigs with blocks in the back and if you stay under 3" in the rear you'll be fine. I never had issues with any of my cherokees/broncos/silverados etc with blocks and real four wheeling.