Is it safe/ safer if your ground wire is much larger than your power wire?

i got an amp run, same gauge wire each way. usual install. now im installing an accessory fuse box under my rear seat that will mainly run 12v accessories - leds, etc. as well as relays )obv the power source will be directly to the battery, anyways - nothings hooked up yet just fabbed up. will a 270 watt 12 AWG... show more i got an amp run, same gauge wire each way. usual install.

now im installing an accessory fuse box under my rear seat that will mainly run 12v accessories - leds, etc. as well as relays )obv the power source will be directly to the battery,

anyways - nothings hooked up yet just fabbed up. will a 270 watt 12 AWG power wire be okay with a 8 gauge ground wire? i figured itd be safer actually since grounding to sanded seatbolt. or should i just do 12 awg all around. please tell me 12awg of legit light stranded OFC copper wire will be plenty. i debated the 8 AWG but that seemed too much especially letting the relays do all the work.

thanks for the input fellas
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