Quoted from Aurich:Primus is definitely the coolest version, if you have the money and want a Woah Nellie get that one.
I still prefer the Pabst version myself. Not a fan of the predominantly featured bald headed Primus character.
As a former owner, the issue I ultimately have with the game (regardless of version) is the limited code - even for an EM remake. The gameplay could really benefit from 1) a greater reward for completing the top rollovers and then shooting the saucer and 2) bonus point scoring.