It's all personal preference. I've got the Juice Platinum with the A2 monitor and I've been pretty happy with it. I really like the gauges and safety features that are built in. It also has a built-in TomTom GPS and an available backup camera. As far as performance goes, SCT seems to be the favorite among 6.0 guys. A lot of folks say that the Edge isn't as safe, but that depends a lot on how hard you drive it. You can set alarms to let you know when you're at a limit (you set it) for egts, speed, rpms...etc.
All that being said, I'm thinking about selling mine before I leave for Afghanistan next month...only because I don't want to leave it installed in case my truck breaks while I'm gone and my wife has to take it in for warranty work. Shoot me a pm if you're interested or if you have any more questions about the set-up.