BEL used to be the holy grail years back not anymore now it's more not another white snake type thinking, they are still a powerful addition allowing you not to produce any normal but people tend to like some pattern or at least patches of pattern on their white snakes.
As far as good looking clean white snake Butter X Mojave or Lesser X Mojave are the best IMO clean white and not prone to bug eyes like butter x butter and lesser x lesser or butter x lesser.
Fire x Fire well it's debatable they will throw pure white snakes but can also throw Bel with yellow pattern which people actually prefer (again people are not into solid white snake as they used to be) same for sulfur.