You can definitely feel the difference. I did an experiment to check if it is only psychologically. I did a slow multi ball topspin session with different 3 star balls and I could name the ball that was played by feeling most of the time . Try it out yourself with seamless balls, hard balls, etc.
Also in a match the difference is extremely noticable. E.g. I have to adjust my BH flick technique for Donic P40+ balls, as they "fall faster" (more spin possible with P40+?) and I would hit 75% in the air. Same goes for red / blue Joola. Red Joola (Prime) play similarly (bad) to P40.
If I play with used Nittaku balls e.g., a FH underspin serve to opponent FH short will sometimes go into the net.
I agree that differences should not matter that much in a match, but I challenge you to train with Joola Flash and then play a tournament with Donic P40+ balls.😁
Also in a match the difference is extremely noticable. E.g. I have to adjust my BH flick technique for Donic P40+ balls, as they "fall faster" (more spin possible with P40+?) and I would hit 75% in the air. Same goes for red / blue Joola. Red Joola (Prime) play similarly (bad) to P40.
If I play with used Nittaku balls e.g., a FH underspin serve to opponent FH short will sometimes go into the net.
I agree that differences should not matter that much in a match, but I challenge you to train with Joola Flash and then play a tournament with Donic P40+ balls.😁