In theory, more fans are quieter since the fans don't have to work so hard to keep the card cool, while one fan has to do all the work and therefore might be noisier. The model differences are mostly in clock speeds and extras, like RGB lighting and generally better components. Some people just want a basic card, others want the fastest possible clock speeds and all the upgrades a card can have. In the end though, a 1060 is a 1060. So don't worry that there's only one 1060 worth getting and all the others are a waste of money.