Which Tank Should I Main?
I have a lot of tanks, but I can't decide with these few.

I have a lot of tanks, but I can't decide with these few.

Garen and Trundle are not tanks.
The choice simply must be Cho'gath. Garen is always banned. Trundle is a troll. Sion is nerfed into the ground with Zac. Cho'gath is insanely versatile. He can mid, top, or jungle. He has a hard cc knockup into slow. He has a scaling aoe silence. He has built in sustain with his passive. And, if that's not enough to persuade you, an ap scaling true damage ultimate that can hit over 1k damage. Hello baron steals and adc 2 shots.
I'm a diamond jg/mid main and I vote Cho'gath!
is probably the strongest right now, just build a Rylai's into full tank and you can wreck faces pretty reliably. I find it very hard to lose as him, especially in the jungle since he can max out his stacks so freaking fast.
I'm personally partial to
because he is such a good duelist (rare for a tanky bruiser) and is so phenomenal at destroying enemy tanks while also being an exceptional split pusher (one of the top split pushers in the game because of his sheer tower killing speed, right up there with Nasus) and a super durable frontliner with his ult active. He also does really well with Titanic Hydra and Dead man's Plate (seriously, AA-Q-Hydra active will half life a squishy in half a second, especially with a sheen item). My preferred build is something like
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and working in
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as necessary/when you have the gold for them. With Titanic Hydra and BotRK, he can build extremely tanky and still deal ludicrous DPS because of his innate steroids.
So it's looking like Cho'gath is the obvious winner. Thanks for everyone's opinion. :) This thread will be taken down tomorrow.
"Who will be eaten first?"
. The only ranged tank in League.
Because Gems.
As a Sion main, you do a great job of shutting down late game carries. Jax, Irelia, and Fiora (just to name a few) all tremble in fear of the manly man shout. The only problem is Sion is an initiator tank. His CD are high meaning you can't bodyguard that well at all so you have to work with team comps that allow you to do what Sion do and protect carries at the same time.
Cho Gath is probably most annoying tank out there. He silences, knocks up and can just devour people. So I think Cho Gath is the champ to go with. 
Alright thanks for everyone's opinions! :P
Zac, because no one plays him and he can be fun and game changing.