I like Tuesdays and Sundays, because the annoying "I don't know how to act in a strip club" people aren't there. Yes, I do mean patrons. The frat-boys-with-four-dollars-to-tip-but-have-to-save-some-for-cab-fare don't tend to show up on Tuesdays and Sundays. On those days or nights, you've got a room full of horny straightforward normal strip-club patrons, dudes who know the score and make sure that they, you, and their buddies get the right kind of access to the girls. (Whatever that kind of access would be, for the club and girl in question.)
But I also mean dancers. The annoying "I don't know how to act in a strip club" dancers are'nt around on Tuesdays and Sundays. The newbie clueless can't-figure-out-why-men-don't-want-more-air-dances girls work weekend nights. Thing is, the over-the-hill-desperate-ugly-and-angry girls do work Tuesdays and Sundays because they've figured out specific cash-per-effort ratios. So Tuesdays and Sundays aren't ideal.
So, the question is still open.
I'm going to say that my "best" part of the week would depend on the club. For a super-glitz ultra-huge club that (a) draws tons of hotties from all around and (b) offers so much extra space that the back-room has plenty of (deliberately) secluded corners for all sorts of extras-activity? I'd say the weekend nights are best -- as long as you can tolerate the elbow-to-elbow crowd and the clouds of cigarette smoke in the air. For girl-next-door conviviality and low-frills conversation with a favorite gal, and then what-not? That might be better on a weekday afternoon if she's working then.
Come to think of it, I've never seen a Superbowl live broadcast in a strip club on any day other than Sunday. They gotta work on that ...