Paint is not just good brand vs bad brand, storage and age can have a major impact on performance, I have used formula 13 dozens of times from a mix of well known suppliers and it has always been good. I have used those suppliers because I know they look after their paint.
However I have also used top of the range paintballs from various brands that because it was not stored properly was terrible.
Totaly agree.
The best paint to get is the paint you can afford.