Ive shot the G5 Stikers for three years. They are nasty, nasty little heads.
I've heard way to many people complain about the Rage heads, for many different reasons and i certainly do not agree with the way they are marketed.
Go with G5 in my opinion. For mechanicals...... in times past i'd say none, but i'm actually going to try a Grim Reaper this fall.
good luck. both will kill, but you'll never see a Rage across my riser...... (i guess i'm lying. I found one this spring shed hunting. Some clown was shooting them outta his xbow at deer....... You may see a video of me shooting it with about five other heads to compare flight......if i ever get my bow set back up)