It is going to be 25% no matter what the parents are, it's basically a roll of the dice. Sometimes you hit the odds, sometimes you don't.
As for the bumblebees: If you are looking to get nice example of a bee you could even go for a super pastel and breed it to a spider to get the 'Killer Bee' which is even brighter. Pastels are pretty cheap and are everywhere, supers are slightly more but not too much.
The nice thing about spiders is there are different looks and are also pretty cheap. For example, some spiders are very dark...some have spots with their webbing....the amount of white on their bellies can vary as well. It's all in the fun!
Pastels can vary too as some are more 'muddy' than others. (meaning they brown out near the ridge of their backs) instead of staying completely yellow. It's difficult to find one with none at all unless its more than a single gene animal which is why I recommend a super pastel.
It's up to you whether you want to watch your snakes grown or not, but be aware that a female can take 2-3 years to mature enough to breed. (Their minimum recommended breeding size is 1,500 grams). Depends how patient you are
As for the male though it doesn't take nearly as long, some as little as 300 grams have bred (600 grams is the minimum in my opinion). Most of the time you end up waiting for the female to grown up
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