I'm not sure about GvG, but I know a lot of Gambler's go full-on meat suit and stack HP. Personally, I'd stack HP after you got enough HV for Full House OHKO's, assuming you're still grinding. If you're not and looking for JUST PvP info, I don't know the balance to look for.
I'm really not well versed in PvP, but I'll say go for mostly HP until someone who has more experience can answer you.
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