I don't really understand the phrase "is it more money"?
Do you mean which is more profitable?
I'd say that ball pythons are more likely to result in large profit, but also more likely to result in large loss. It's basically a pyramid scheme, but you can buy your way up the pyramid.
You need to spend lots of money to stand a chance at a profit.
If you mean profits, ball pythons would probably be more because they have a larger target audience. If you mean costly, probably boas, just because they need larger cages and food and everything.