you can make leafs ride nicely. with a nice pair of shocks could make it nice and stiff. you could change the rate with how arched the leafs are or the number of leafs in the pack. with coils or coilovers you can easily change the way it rides stiff/ soft etc basing everything off of spring rates and valving of shocks. i love my coilovers because all my truck sees is road. i think it would be a bit more difficult to do a coilover setup just because of all that is involved. with leafs it seems a lot more straight forward. there are pros and cons to both.
Estate Green '01 Sport Trac 2wd 4.0: warrior shackles,15x8 pro comp 152's wrapped in 33x12.5 Mastercraft Courser M/T's, Xentek 5000k HiD's, 20% tint, King 2.0 x 6.0 Coilovers, Fox 2.0 x 10 with resi's, shock hoops, boxed and johnny jointed a arms, and foa bumps, coming soon: spindles, and uniball uca's.