I prefer the oval! Dissenting opinion but I like things that are classic with a twist. Plus an oval looks bigger than a round of the same size. My fav shapes for tennis bracelets are either ECs or ovals actually.
I am not a fan of oval as a solitaire but I do love oval eternity ring hence this oval tennis bracelet looks as good to me.
Please note that more diamonds needed as compared to round for a bracelet.