I have the Edge Comp and have been pleased ever since installation (about 4 years ago). It does timing and fueling, and is adjustable in the cab. If you don't tap the VP44 wire, the Comp will act exactly like an EZ, but with more fueling adjustability.
I've heard about customer service going down at Edge, but have not experienced it myself. My unit is out of warranty and if anything happens with it, I would not hesitate to call Edge before making a decision whether to replace it with a like unit or a different box altogether.
From what I've read, the Van Aaken box makes power down low better than the Edge products, but the Edge products make better power higher up in the rev range. As far as which is the better box, I dunno. Do a search on here and you'll find DAYS of reading on all the boxes.
Whatever you decide, have fun and enjoy the ride!
Duane