Best competitive swim suit for a 9 year old girl?

... Wouldn't an aquablade tank do for a 10&U? ... Agree. Definitely a classic style suit. IMO there are a lot of reasons for not getting kneeskins. 1) Sends wrong message - swimming fast should be about swimming, not a suit - see Fort's comment. 2) Probably impossible to find a pair that fit and poorly fitting kneeskins are definitely going to be worse than a well-fitting classic suit. 3) Too expensive. This is why I suggested the Yingfa. It's "techy" enough to feel special - like you are getting ready for something big, but doesn't cost more than the typical team suit.

... Wouldn't an aquablade tank do for a 10&U? ... Agree. Definitely a classic style suit. IMO there are a lot of reasons for not getting kneeskins. 1) Sends wrong message - swimming fast should be about swimming, not a suit - see Fort's comment. 2) Probably impossible to find a pair that fit and poorly fitting kneeskins are definitely going to be worse than a well-fitting classic suit. 3) Too expensive. This is why I suggested the Yingfa. It's "techy" enough to feel special - like you are getting ready for something big, but doesn't cost more than the typical team suit.