I have a hard time with this one. I run yeah racing 3200 20c packs and was racing a buddy with a smc 30 c pack. both cars geared the same , same motor and we were dead even around the track. he had no more punch then i did.
we have since switched to all yaeh lipos and have never looked back.
Maybe if you were a a main guy 1-2 place finisher it would make a very mild difference. like .010 or so IMO
good luck