The one with Buffalo Gold is called Wonder 4 Wonder Wheel (thank you Youtube). That one has 5 bet levels with the lowest being $2-$2.40 depending on what games you pick of the 4 available. Most of my play is at the lower 2 levels. I usually start at $4-ish then go down to $2ish or up to $4ish depending on how it's paying etc. I also change games a lot. I've avoided the highest two bet levels - $8ish and $12 - because the few times I tried this plus the numerous more times I've been next to someone playing at this level.
The one with Wicked Winnings 2 is called Wonder 4 Jackpots and on that one I have probably played most at $10 or $8. I usually start at $10 and work my way down depending on if it's paying or not.
I have not seen the one Mickey posted ever. I do not know the base games on that one so I am not sure how they pay. I'm not sure I'd like to play that one because of the base games. But I don't know them either. Some Aristocrat slots can give nice huge wins but it's a lot of nothing in between, whereas at least the ones or some of the ones on Jackpots or Wonder Wheel spread the wins out.