6 Star Rank-Up Choice for Act 6?

Hi all, which 6-star champion should I rank-up as a Summoner looking to complete Act 6? All unawakened. Any thoughts would be appreciated.
As a side note, is it generally better to rank-up 5 stars or 6 stars at this stage? I also have several Beyond God Tier 5 stars at Rank 3/4.
Thanks!
As a side note, is it generally better to rank-up 5 stars or 6 stars at this stage? I also have several Beyond God Tier 5 stars at Rank 3/4.
Thanks!
6 Star Rank-Up Choice for Act 6? 53 votes
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Comments
To answer your other question, it depends on the 5* and 6*. 6* champions, like doom who don't need their awakening or dupe are the obvious better choice to awaken, but if a champion needs/wants high sigs, like omega red, then the 5* would be better.
5*s are capable of doing all the story content, so it really won't matter much in the long run who you rank.
Mags is already very good even at rank 1 against robots, metals.
Annihilus? Don't know about him.
Warlock and overseer both got their utilities along with great DMG. So, go for both if you can otherwise go for the class you have lesser champs in or just your own preference.