My biggest concern with Garen is if he's still viable, I've been hearing that he was nerfed bad. Any advice guys?

Pretty sure he's still viable.

Garen still viable, still see him banned alot in ranked though..
Udyr is a good jungler, and should jungle.

So yea, imo if you're going to Jungle alot, pick Udyr.
if you feel like running an off-tank, Garen.

Buy Garen if you want, but don't expect to play him *cough perma-ban/pick cough*.

Udyr is probably more fun to play. Shouting Demacia just.. ah I'm lying. DEMACIAAAAAAAAAAAAA!

garen got a really small nerf, go for him if you already have a decent jungler like warwick or olaf

i bought & played garen for the first time today, and roflstomped with zero effort. he seems playable to me.

Udyr, we need more junglers.

Neither. Get some new runes.