Standalone can get a more precise tune. I'm running piggy backs and there is a slight blip in the tune where it goes very rich. And I've looked and looked and it seems that it's just normal for piggy backs to do things like that. I'd say standalone. By the time you get the neo or whatever your poison is for piggy backs, you'll wish you had went standalone. Lord knows I wish I had gone standalone when I had the chance.