Opinions on who to rank up

Hey all! I'm not in a big alliance so materials are scarcer for me than others. Want to make the best move here. I am currently on act 5.4.5 (Mephisto). I don't spend $$ on the game but I do the monthly event to get at least the 1k 6* shards ect. I also don't have suicides. Should I wait a bit longer and take a 6* to r3 or rank up one of my others? I do have a rank 3 colossus I like a lot but I could take 2x 5* from rank 4-5 for roughly the same I would cost to take him rank 3-5. Any help is appreciated! 
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