Boxing / Sparring in USA would improve any fighter from England ?

[El Kabong]

Actually i think an american fighter spending sometime in europe would be more beneficial because the stress the technical and defensive side of boxing more.

And it's for that very reason I will say....

"It depends on the fighter"

Some guys can stay away from home, some can't , some need technical help, some don't, some do well with sparring, and some don't.

I think the better trainers are in the US though: Steward, Roach, Brooks, Goosen, Rooney, Atlas, Torrance, The Mayweather(s), McGirt, Birmingham