Which is better as well as who to rank up

Im a level 45 fairly new/returning player and at the end of the month I'll be able to rank up my first 4 star to 4/40, question is it's between AK doc oct, AK kingpin, AK hood, non ak medusa or rank 2 a 5 star beast.
Also which is better for act4 and stronger a AK 4 star 3/30 iceman or a AK 3 star 4/40 iceman. And between a 5 star Beast 2/25 or an ak 3 star 4/40 quake? Thanks
Also which is better for act4 and stronger a AK 4 star 3/30 iceman or a AK 3 star 4/40 iceman. And between a 5 star Beast 2/25 or an ak 3 star 4/40 quake? Thanks
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I agree. I don't believe there is such a thing as a "best" champion at everything, but of the champs you list the 4* Iceman is the most versatile champ of the bunch and would be the most useful in the most places. He is triple immune (immune to bleed, poison, and incinerate), his damage is decent, and his ice armor provides a mechanism for dealing with champs that gain power quickly - if you play well and keep ice armor up you can absorb any one single attack which includes special three attacks while taking only 5% damage.
Iceman has no healing so he is not a traditional sustainable champ in long paths, but the fact that you can't bleed him, can't poison him, can't incinerate him, and can't kill him with special three attacks makes him a very good path runner and very good boss killer. He is also decent on defense, which makes him one of the more versatile champs in the game right now.
A slightly more detailed version of my post right here! Ignore the threads questioning Iceman being god tier or not, he is useful for every aspect of the game.