DoctorSpuds

Um, there's not two separate released games. There WAS a totally different Star Raiders II that was being developed, but it was never released back in the day: http://atariage.com/forums/topic/246591-wilmunders-star-raiders-ii-released/page-1

On Atarimania there are two different Star Raiders II's listed, one uses Atari XE packaging and the other uses the traditional Atari 800 packaging, the XE version was released on Cartridge and the 800 version was released on disk. It seems the disk version is rarer but I don't know by how much

Is this the disk version you're referring to?

http://www.ebay.com/itm/140953378168

I don't know whether one is rarer than the other, but they both tend to go for about the same price. As I understand it, they're both the same game, just released in different formats.