The Lite series is of a smaller size physically.
The standard Edge is physically large by comparison.
I would use the Lite version to save space and weight as well.
Check out Castle Creations for a picture of each of the ESC's you are pondering.
Both are 8S capable but the standard Edge heat sink is MUCH MORE robust that then Lite.
If you check the GARAGE selection on their site, they have the previous model LITE 50A esc going to 50 bucks. I have a couple of them and they work nice.
just remember to download the castle software and get their cabling for computer to esc programming. (the name escapes me)CastleLink. Thats the one.