Honesty. I say when it comes to ax. go with the best looking baby no matter what gene.
On the other side, when it comes to browning out. I just think of it this way.
All the snakes will "brown out" even if it is a pastel. Though I rather have a brown out axanthic spider who looks more greyish brown then a regular spider. :p
Plus you can always get a cool ax bumblebee. I just love them!