Ideally you would want a solar version of the six dreg pride because there are currently no other solar hand cannons unless you can get an adept version of the Jewel of Osiris if you make it to the lighthouse. The perks remain the same no matter which version you get with the exception of the type of damage it does to fallen enemies. I think you would probably want a gun that has damage buffs against fallen enemies in general or vandals/captains. Fallen tech that has buffs against shanks and dregs is considered pretty useless (for now at least)... I would say to keep the void SDP if you are a collector and only dismantle once (or if) a solar version drops for you. But at the end of the day, a void SDP is not as good as a Word of Crota.

It looks prettier than the Word of Crota, but is realistically a worse gun.