Another Rift supreme selection question... sorry guys.

Was planning to get Ifrit, but seems general opinion is that Shiva is better. And what about Odin?

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My situation:

>>> I ONLY care about towers <<<

Attack supremes: Bahamut, Floral, Godo, Yiazmat, BFA, Ragnarök, Duncan, Minwu, Sin, UB

5* Weapons: OAM, Taiji, Wolf star, Laevateinn, Curtana, Chaos cresent, BE, Septentrio

My motivation for Ifrit: Duncan is the attack supreme that I have used the most. I have 3 great 5* monk weapons. I have V Monk.

My concern: People say there are not many good users. But what about Ex Monk II?

I don't find myself using Minwu that much, even though I think there is a decent amount of string users for it. Why would I use Shiva more? Is Shiva better because it can be used on lots of jobs in EW (which I dont care about)?