super stripe is easier to produce.

super specter is more valuable and clearly more popular. they are rare compared to super stripe, but that does not mean they are less popular.

if you want a great-looking pet, you buy the cheaper and more easily available super sripe.

but as a breeder, when you for example breed a super stripe to a pewter spinner (cinnamon pastel spider pinstripe), you will have no chance to tell apart the specters from the yellowbellys. one half will be yellowbellys and one half will be specters, these are hard to tell apart, add a bunch of extra genes and you will be lost. super specter solves the problem, you know exactly what you get when you breed it. for example, when you breed a super specter (with extra genes) to a yellowbelly (with extra genes), you get super stripes (with extra genes) and specters (with extra genes). that is easy to identify.