It's an interesting question, but ultimately a completely movable feast I feel...or only "correct at time of going to press"

Some pellets produced from one batch or die will be better than another.
Wear will eventually mean the batches change over time or as another die gets introduced.

Price pays a part too even for some competitive shooters I know : They know pellet X is better than pellet Y - but are happy to trade off a small decrease in accuracy for a more appealing price (never quite got that one personally given the difference is probably a penny a shot) seemingly in the belief that their level of skill cannot fully utilise the extra accuracy offered by the higher priced item.

Add in the introduction of the latest 'wonder pellet' and small production variances in even the same model of gun during its lifetime and even differing disciplines and ranges encountered in competition use and any answer becomes both very personal and 'of it's time'.