As you note, you've only played the lower-end, paid balls. I guarantee you that you would see a big difference if you played some higher-priced balls.
it does depend on whether he is talking about how his clubs play with sponsor apparel and without sponsor apparel.
lower end / cheap balls can play quite well and competitively with apparel. higher end balls, require a better understanding of how the spin and distance will impact your clubs if you don't have them mapped.
that said, as you noted, without apparel... a higher end or even med range ball can play much better with default clubs over a lower end ball.
with all the new variables with sponsor apparel and when it is in play and when it isn't, it adds another layer to the choices people can make. imho.