I have 5* r4 void i know he become god tier with sig ability but still now i fight most of with him with help of killmonger i got that 1% regen on putting debuff on opponent.
Easily quake, even if void was max dog is still go quake, but especially unduped, void needs the dupe and he also does his job at lower ranks, quake gains a much bigger benefit from higher rank and has no reliance on her sig
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If you've got skills with Quake and feel like you NEED to do the R4 now then definitely go with Quake. Otherwise I'd hold off.
I've got Ghost at R3 and a Tech AG but I'm holding off on the Rank up because I just can't use her properly...yet...