Where is the best place to gamble? Is there any merchant that is better? any difficulty better than the other?
all the same...
only your char level is of interest
k. i got a 47 sorc. so the higher lvl the better?
yes
it depends what you like to gamble, low level stuff can get hard to gamble with a high char and high lvl stuff is impossible to gamble with a low char
you will be able to google for diablo gambling guids, shall give you a lot of things