My truck's at SLR right now. But between Calmini and PRG, IMO--PRG. The Calmini kit has lots of components, but I'd rather start with some PRG stuff and mix and match with the shocks. And the TC UCAs that PRG offers are working well for people.
What would you prefer 5" of lift with a diff drop or 3" of lift w/o diff drop?
With the Calmini you'll get two more inches of lift all around except for the front cross members where you will actually get 2 inches lower than with the PRG, but will keep your half-shafts and steering at a safer angle.
These are two very different setups with different qualities and depends on what you want them for.
Also depends if you're talking about the 3" spacer lift from PRG or the adj. 0-3" Radflo coilovers from PRG.
If only cosmetic, the 3" spacer from PRG is about $1300 CHEAPER than the Calmini lift.
If I wanted a better functional suspension I'd choose the Radflo's from PRG and get more travel and not drop the diff as opposed to the Calmini lift.