Reading the replies it seems different people have had different experiances with both companies but both are respected and reccomended.
Either toss a coin or go with what your wallet says
Basically the same product, 1 is $100 cheaper and has 3 extra eye pieces, the other has a shiny sticker that says Bintel
Bintel
possibly has the edge in the knowledge and after sales service area though both are excellent.
Not much goes wrong with a GSO dob