Anthony Martino
Royal Flush
I would only be making a calculated guess here, but I would think that Vegas would be the best location for a poker pro. Lots of tourists bringing in a ton of fish money. Also more venues to choose from. From the perspective of a business investor, I am reluctant to invest in a company that gets the lion's share of their profit from a single source, so to carry that logic into the poker pro world, A pro's income is safer if they multiple casinos to work out of, just in case they get banned, there's a fire, a better player shows up at your table, or the casino goes bankrupt.
I also believe that Vegas has a much higher percentage of big-name poker pros. I would guess they live there for a reason.
I was actually going to rank Vegas last if I had to guess
Texas
Florida
LA
Vegas
If I was guessing the best options to play for a living, for the average pro (i.e. not nosebleed stakes)