I would go with, look up what snakes you like, do your research and get that.
My first snake was 2 corns. I didn't like them too much, too small and escape artists.
Swapped them for a Royal, haven't had any problems with him since I got him. Much bigger so is less likely to escape.
My second snake was going to be a burm, until I have had problems with last two I tried to have (none of which were my fault).
So now I am doing some conversions and getting two Amazon Tree Boas.
It's all down to preference and what you like.