The body lift will give you alittle better approach angle, as your bumper is higher off the ground, however the frame and all is still at the same height....
Most probably know what I posted below, but sometimes this info is overlooked, so....
A few things to keep in mind when looking at lift size....
One major thing to remember about a suspension lift... your frame is higher, but the height of your diffs is the same as stock, now when you put bigger tires on... remember that you are only increasing by half the added tire height... so using BFG ATKO 285/75/16 the tire is 32.8 the stock is 31.6... so the tire is 1" taller... but only halve that heigh is below the centerline of the tire... so you gained .5 inch of tire lift..... so your actual ground clearance went up .5" (yes the frame is raised more, but ground clearance is measured from the lowest point (the diff)... not the frame)
Also remember, the front diff stays the same hieght off the ground as stock (excluding tire lift) as it drops with the new sub frame.
IMO... figure out what size tire you want to run, then pick the size lift needed to fit them.... going higher then needed for the tires only uneedingly increases your center of gravity, and having the truck way up in the air with tires that are smaller then could fit to me.. looks like hell anyway....
Grey