thinking about buying one but im not 100% sure yet

For me it is autopricing! My most important sp income comes from my shop(s) and autopricing saves me a lot of trouble and time.

the benefits are listed on the page where you buy the gold accounts https://subeta.net/cashshop.php?act=gold just hover over each one for more details

edit: I don't believe it lists this one but you also get 5 extra quests, so instead of 10 per quest giver you get 15.

More specifically the beta benefits of GA is not listed. The Minion Zoo allows you to collect minions and fight with them. You can autoadd mass amounts of some collection items. Right now this feature does beanbags, trading cards, pumpkins, and plushies.