I'm pretty sure GlennO is correct. Black galaxy fishbone shrimp are caridina, not neocaridina. To answer your question, I also like yellow ones, since they almost seem to glow against a black background, but I also like the blue ones.
Neo's: orange rili, zgjiajiensis var. snowball, and deep blue
Caridina: despite all the pinto's (such as the aforementioned fishbone) and pure lines, I still fancy red wines, shadow panda's and blue bolts. Don't ask why.