you can't go wrong with either.
I was in the same boat a couple of months ago. I went with a mix of both with a little sc&c sprinkled in. then a little of my own customizing.
I kept my stock sub and added a speedtech chicane kit with 5" stroke ridetech tripples and ridetech 2" drop spindles. these were bolted up to modded sc&c arms. I had to uses the chicane double shear lower mounts welded and bolted to the bottom of the lower arm. I also had to clearance the lower around the shock body and res line since it went through the coil spring mount. the adjustable sc&c uppers are the shiz. all of this fab work allowed me to run a 5" stroke shock with a 12" spring.
the rear is the speedtech tq arm with the exact same 5" stroke shocks. the speedtech kit is set up to use a 4" shock so I had to add an extra tab with one additional bolt hole onto the control arm brackets to get the ride down to where I wanted it.
....and where I wanted it is down to the top of the 19/20 wheels. this was no easy feat with a 27" front and 28" rear tire. the bottom of the sub is at 4" off of the road. because of the weather, I haven't gotten to drive it anywhere other than to the muffler shop. so I haven't had a chance to start dialing it in.
all I can say is that it looks absolutely WICKED. the stance says F@%& YOU!!!
if you have no fab or welding skills nor the equipment to do it with, you will be better off sticking with a complete bolt in system. but there is a sense of accomplishment from planning and executing your own set-up.
don't you just love it when a plan comes together???