Either is fine. People use a mix of both, and they're both accurate, so whichever seems more logical to you.

[An easy substitution for whichever you prefer, here.]

I've no quarrel with the idea that you should look for quality materials, but Lazar has a history of trying to enrich himself in a variety of ways, not all of which are honest. I'd not see him take advantage of your unfamiliarity.