I think you pretty much answered your own question in the last 3 lines.
I agree that if you are a gambler Macau offers you a lot of fun and will be the priciest but probably the best quality and diversity compared to BKK and AC. Bangkok offers the most culturally and the most pleasurably and since it is the big city there are more things to do, but will be the toughest travel. AC will probably have the least attractive girls but yes it will be the bbftb and when you say, "nothing else to do but sex!" I fail to see how that's a problem?
but it depends on what are you looking for? obviously carnal pleasures but what else? relaxing time (AC)? gambling (MFM)? good food (BKK)? lady boys (BKK)? With only 2 days you are going to concentrate your efforts in one place so the other question is what kind of girls do you like? and what are you willing to sacrifice for better service?