If Kelly Rowland had recorded Dangerously in Love as her solo debut, and Beyoncé was in Dilemma with Nelly

would the success on both songs remain the same, or would it be different?

Different...

Beyonce is undoubtedly a better singer and a performer than Kelly, and her voice suits her songs the best.

I think if beyonce did dilemma and kelly did DIL, this thread wouldn't have flopped.

The album didn't really matter. When you're trained from young to be someone's back up singer that's another story.

This tbh. The success of each member mostly depended on who was singing lead.