Duped 4* unstoppable colossus or 5* unstoppable colossus?

Mongoose

So I’ve been saving my loyalty points for almost a year now and am real close to having enough for the 5* unstoppable colossus. But I’ve been wondering if I should get it or spend the loyalty on a 4* and then duping him. I’ve only got two 5*’s right now and both are only R2 (still trying to get enough t4 cat’s to rank up) I should be finishing act 4 in the next month as well. Thoughts?

Skimbobbor

Only invest in the 5 star if you want to save again and dupe. In my opinion he isn't useful unless duped, arena points aside