So if I get back into SR I'm thinking I might play Support more often, I haven't played it much in the past although when I did I general did decently. As for supports I play now my favorite would probably be 
, I do enjoy playing 
although I'm not that good with her. I've had decent games with 
but I find her boring and hate playing against her. I like the new 
but have only played her on Aram.
stealthfox941 votesOr any other suggestions.
Laughing Fish1 votesDepends. If you want arguably the games best play-maker, than 
. He has a hook, a massive AOE slow, a shield, the ability to move allies to safety, and more.
If you want the manliest, most heroic champion in the game, than 
. He has an incredible anti-projectile shield, tankiness for days, a massive AOE knockup, and the greatest stache in the game.
stealthfox941 votesWhat's the best build on tanky or just support utility with some AP?
Laughing Fish1 votesI would hardly consider myself a thresh expert, but I usually build him tanky when I play him, getting face of the mountain, ruby sightstone, Locket of the Iron solari, and Frozen Heart. But again, you should look for some guides from people who are more experienced with him. Here is a good one from Mobafire: http://www.mobafire.com/league-of-legends/build/season-5-support-thresh-guide-work-in-progress-405271
TeemoJenkins1 votesBraum is style, Thresh is utility. Leo and Morg are my two main supports.
GeoPeter1 votesHow can you not choose the mustache ?
It really depends on how you want to play your support. I personally love Braum because I prefer tanky bruiser champions and I absolutely love saving my ADC while providing a stun from my passive. If you like more of a poke-support and good for setting up kills, then Thresh is your guy. Also note that thresh has a higher skill cap than Braum.
I've heard people compare Leona and Thresh in play style, so if you don't like Leona, you may have a hard time with Thresh. Honestly though, supports come around pretty quickly in free rotation so I would just hold off until you've tried them both.