So there's a couple of reasons o choose psychic and people can debate my choice f they want. (That's what these boards are for!)
I've never played a psychic before
I've always had preference for spontaneous casters vs prepared.
I get more skill points than with a sorcerer seeing how psychics use their Int for spellcasting
Focused Force for obvious reasons
With the faith discipline I get spiritual weapon as a bonus spell
I'm not impeded by silence or hold person
Pathfinder savant for the esoteric magic feature that allows me to pick up spiritual ally among other spells
Another spell that is useful with this PC is force sword. Though not legal yet in PFS, it allows the caster to cast a longsword that can be given to other PCs. Couple that with toppling spell!
I haven't looked at the shaman combo above. I tried playing a shaman but didn't like their flavour. But I haven't really given the one I made a chance so will look into it.