The baby sugar gliders are individually priced based on color and sex, the females are typically priced a bit higher since they don’t need to be neutered and are generally more valuable for breeding. Other than that the males and females have individual personality so it makes no difference pet wise which sex you end up getting. Two intact males can most definitely live together, as well as two females. Male and Female pair will obviously breed so unless you are prepared for babies or to neuter the male I would not suggest that route.
Getting the gliders as babies helps with the introduction part as well as with bonding.