Not worth the risk.
I've found that repaired drives from Seagate do have a shorter life than brand new ones. I'd only consider one if it was less than 2/3rd of the new price and I wasn't using it for anything important. so voting cold because it's not sufficiently cheaper.
That is a lot of data to be put on a faulty HDD scratch that, recertified HDD oO
Voted cold. A cased 3TB new drive should not be more than a few pounds extra. Why take the risk with your data?
Im very fragile to venture into these waters of re certified. But il add heat for the price and size :)