Which ever tbh. No content in the game requires either champ to be r5 as opposed to r4. I’m valiant and yet to r5 my herc. Not because i can’t but because i haven’t found a need to.
Hercules, bcoz ranking up your CGR and max him only decreased the duration of fight atmost 1 combo but hercules damage is increased to a comparatively greater extent for medium fights and BGs.
The only reason I'd suggest herc is because you'll never see him as anything above a 6*. Cgr has at least a chance albeit a slim one and probably very far away from happening.
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CGR if your main focus is BGs