Whats the difference in casinos btween local casinos, big casinos and then say las vegas?

i live in central Cali and we have an "indian" casino. its kinda small. then i know los angeles and san diego have their casinos (indian i believe), and of course theres Las Vegas. So WHATS THE DIFFERENCE? i mean say if you playing slots and those video machines, arent they ALL the same? Then theres also blackjack, roulette, craps, etc? Arent they all the same?