not 100% as haven't got a 5 star yet but I'd say concentrate on your 5 stars.. would imagine in the long run would be more beneficial. also take into account who is awoken if they are..
maxed 4* starky is really good but long term focus on 5*s so go ultron. hes very good still. when he causes bleed his attack is super increased per stack. he has evade. every 5th hit is crit so time a special or heavy with that. has 2 free regens and is double immune.
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need i say more?
5* ultron!