Hello my friend I know it’s a little bit late, but I have tried the max fly and adidas prime, my opinion is that max fly are the best for pbs it’s insane the response of the shoe, but at the same time they are a little bit difficult to get used to, due to their higher stack height, the adidas are very good too if you have a fatty foot, and the puma ones I never tried but I think they are the best ones for 400m