It depends on whether it 'matters'
The lowest grade will be more likely to be cheap, inconsistent in size with harder shells. It could have a nasty fill mix which may stain or leave residue. It will probably go through bushes.
The highest grade should be the 'best' of everything with consistent sizing, fragile shells etc. You may also find a resealable bag in the box for leftover paint at the end of the day. The fill should be thick and bright, but clean away afterwards.
Rental site will be the lowest grade, but part of its poor reputation is also attributable to the fact that it could be sat around in storage as they may not be sure how much paint they need in a weekend - customers may not all turn up and could stick to minimum shooting or twice as many people turn up than booked and through their wallets across the counter.
If the paint you shoot fires through your gun well, is consistent, shoots in a generally straight line, survives passing any undergrowth in the way and breaks on targets then it's good enough paint