Edge's voice is no where NEAR as developed and poweful as Bono's. "talent" aside, I think Bono's voice is much better simply because he's been singing for almost 30 years. Technique-wise, Bono still has a lot to learn, but to date I haven't heard Edge sing anything that makes me believe his technique is any better than Bono's. When Edge sings, he just sings along, there's no emotion or anything special about it. He's a great backup vocalist, but if he had been the designated frontman, today I'd probably be like "U- who?"