Stay away from 3tbs, they are known for crashing a lot. All the drive in this capacity 3-4 tbs are slow for a primary drive . 4 tb from Seagate is a 5900rpm one and is the most reliable 4tb in the market.
WD 4tb and other brands are even worse, since he has no other choice in this capacity.Seagate reliable ?
i would suggest WD purple / Green if budget is tight. Or else WD Red, and if you know where to buy you can def get it cheaper than most of the places.