The key is research....
I am mainly an Indy guy, but occasionally visit an MP. No matter which I visit, the key seems to be to do a lot of research on the girl and/or the MP that you would like to see. I find that I get more VFM from Indy than MP typically, but that is just me. Other guys have a great time at a MP, depends a lot on what you like. I have also found that there are some very good MP girls and a lot of them that I would love to see if I had the time and money to do so.
Oliver makes a good point. When you talk to a girl, Indy or MP you can get a good feel for the kind of person that they are and that can lock it in or send you running into the night. BTW, Indy girls are also running a business, just not the typical storefront type.
The key is research, probe the board and find other people's thoughts and experiences with whichever way you would like to go.
There are some real gems out there and some real horror stories as well.
Beware of the girls you find on Craig's List as there are many on there that are a big time rip off. On the other hand, I have found the occasional gem from C/L, the key is....research.
Do your research and you stand a very good chance of having a great experience.
Good luck