Which should I get (please dont say both because that is an absolutly stupid comment and I will judge it as a spam).
Pantheon is good at dealing tonnes of dammage, Shen is good at supporting teamates on other lanes.
Overall the two technically have the similar ult (both can teleport).
I already have Tyrndamere and Fiddlesticks if that helps (I am lacking a tank, which according to Shen's profile says hes kind of tank)

Both.

shens a very good tank but it depends on more. It really comes down to what runes you got for what. It also depends on your playstyle more then anything. Hope that helps

not to spam.
but I would personally say get both.
they're good in their own ways for the style of play that is required and your own personal style of play.
only difference is that with Pantheon rapes face with moderate CC and Shen has no face raping capabilities and a good CC. both their "supporting" roles are good and revolves on how well you and your teammates do.

shen is a good tank. not the best but good enough. the nerf to his shield hurt him a bit though. smart players burst their targets down really fast especially those that are being saved by shen.

Rammus is currently one of the better tanks i believe. with a 4 second taunt. but that's just based on statistics.

imo try them all out till you get one to your liking.

Shen is dependent. Panth is independent.

Panth can solo a team if needed later on, if you got fed. Shen can't and always needs a competent team.

If you want less frustration, go Panth.

Shen is high risk in solo queue

shen and panth get banned alot in ranked games lately too

I'm in this situation atm lol.