You are a little contradictive in your post, but I'll try to answer some of the questions.
Who fights better, lightweights or heavyweights?
They fight differently. Heavyweights are naturally slow and strong, with poor stamina compared to a lightweight.
The pace will be much lower out of natural reasons, and the heavy will be more aware of incoming punches as one shot is enough to stretch anybody out.
I think people say lightweights are better because they are more exciting and fight at a higher pace.
But a lightweight-style wouldn't be successful in the heavy division. Probably.
And vice versa.
Weight training will not hinder your fighting ability, that's true.
If done correctly I must add.
But a man who's naturally 90kg will always be stronger than a man who's naturally 70kg but bulked up to 90.
That's why fighters don't bulk up too much, they would get killed by an equally good fighter who's naturally stronger.
If Amir Khan goes up 10kg, he's fucked. People there are just too strong.
He might fill out over time naturally, then it will be another matter.
Thank you, brilliant post.
I think people say lightweights are better because they are more exciting and fight at a higher pace.
But a lightweight-style wouldn't be successful in the heavy division. Probably.
And vice versa.
You haven't actually answered the actual question here. Either the lightweight or the heavyweight must be a more efficient fighter, else they would not have the divisions.
Which fighter is better? Does anyone know?
I have broken my nose 5 times now, and it looks like it is perfectly normal. The trick is getting it fixed properly or learning to do it right yourself.
You do it yourself?
I notice a lot of professional boxers don't seem to have such damaged noses. Perhaps there is some truth in this