I like most of the sync with is pretty clean aesthetic, but not being able to tag users unless I pay is lame.

Boost lets you tag users but you can’t change the color of the up/down vote buttons and you I was unable to use spoiler tags.

I haven’t tried any other but I did see some that showed the number of exact up and down votes each comment and post had that looked cool.

So I guess in my perfect world it would be an app that lets me use any colors for things I could want, has working spoiler key, lets me tag users and shows me the up/downvote numbers. That last thing being the least important I would say.