Oak is challenging--you need to err on the side of subtlety, or suddenly your wine tastes of bookcase.
Are you looking for a specific oak character? Dryness (tannin), vanilla, smoke, honey, coconut? You can add those with oak, and you can add them with some other tannin-based products.
I ask because it's always important to have a goal in mind before you start making any kind of addition or alteration.