I'm a sucker for normals, but lueicistics & patternless are interesting. Anery or axanthic morphs also make my heart melt.
edit to add: My favorite normal snakes are Green Tree Pythons, Brazilian Rainbow Boas, and Amazon Basin Emerald Tree Boas. Nothing gets better than these three snakes, in my opinion. I already have a BRB and I will aquire the other two sometime next year, hopefully