My personal opinion is you can get much better textured milk out of hilo than skinny milk.
However, its really what the customers want. You could always ask your regulars which theyd prefer and use your poll to gauge which way you should go.
If I was a regular at your cafe Id be happy that you guys cared about my opinion.
As far as milk goes Bannister Downs is really popular over here in Western Australia for its quality:price ratio, but I dont know what the popular milk for baristas is over in that way. A2 is great but kind of the next step up.