which one 70-200?

I need some help. I am looking at taking some High school water polo / swimming pictures like the ones listed below. I am just a father taking some pictures for the team. I am looking at either the sigma, canon or the canon IS 70-200 2.8.

I took these with a 75-300. I am also looking at basketball when the HS team begins.

What would you guys suggest?

Thanks

Copper

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When I took pictures last year of my daughter's swimmeets, sometimes I used my Sigma 70-200 f/2.8 & sometimes, when I was where I could get closer shots, I'd use my 85 f/1.8. They both did really well. I also used the 85mm lens at basketball games.