There is no advantage between 30 day account and a new pva from my experience
i suggest to get a 6 months pva or a 1 year pva. since facebook already trust this pva.
but if you use it for spam and not long term old pva will just last you a month.
It depends totally how you use it. if you are spamming groups then it wont matter how old the account is, it will depend on how many people mark something as spam
The purpose is not to spam, but rather add members to my group.
By adding my target profiles as friends, then adding them to my group, by posting code into fb servers