I like them both. I like the female better, but I'm not sure it isn't just a better picture rather than a prettier snake.

If you want it for a pet, pick the one you like. It doesn't matter what anyone else thinks.

If you want it for breeding, get the sex that fits in to your plans. If you don't have specific plans, a male can be bred to several normal females each year to produce lots of spiders, so that might be better.

And, if you like one better, but the other sex is what you need, then I'd suggest you keep looking until you find one of the sex you need that you really like.