Seth Rollins he is a dick he left Roman Reigns and Dean Ambrose vs Wyatts on Raw I thougth he was all high flying and hair dying but now he does this wow just wow I hope he never wins again
I see what you did there......
As to the OP, think of it this way:
Reigns is Cena/the Rock/Hogan.
Ambrose is Punk/Austin/Piper.
Reigns is Bryan/HBK/Flair.
Reigns will be the over-the-top huge star, who, whether he's face or heel, will get pushed. Ambrose is a very talented in-ring guy who can get over with his mic skills and plays better as a heel than a face, but will give enough of an "anti-hero" vibe that he will be able to work some as a face. Rollins is a high-flyer (although that's not all he is) and has the best technical skill of the group who will work better as a face than a hell, but he'll be able to generate some heat when it's called for.
As far as success? It really depends on what you mean by "success". Chances are that Reigns will carry the big belt around more, but (as has been said on this thread ad nauseam) all three will have solid careers.
wk