I cant say about sugar gliders.
But SFS are pretty easy to take care as long as you do the research and thier requirements are met. Mine can be a handful at times but just something you get used to after awhile.
I think it comes down to the personality of the animal. Mine has a good temperament takes alot to pee her off. Yes SFS are clingy too. If she is not on her wall or the curtains then usually she stays on me or underneath my shirt.