Davio knows what he's talking about!
Incidentally, at a tangent, do you think there's room for Hoard in a Vineyards game? Difficult to speak generically I know, but what's your broad analysis on this?
Surely not.
I mean, the only thing you need to buy a Vineyards is a single Potion, you don't need any other currency.
If you go with Hoard there may be a lot of times you don't draw it with a Potion, what are you going to do then, buy an Estate?
And the Gold is not necessary at all, would you use it to buy Action cards? There will be a lot of cheap Action cards anyway and there will be more efficient ways to get Action cards like Ironworks/Workshop/University, etc.....
Hoard + Vineyards is a bad combo.
What you need with Vineyards is simply to win the split and for this you need good judgment on when to buy the Potions. The obvious answer is: Sooner than your opponent.