Card packs or Adventure?

I came back Hearthstone recently along with the Descent of Dragons release, heard that there is a nerf coming but I haven’t finish buying Saviours of Uldum adventure. Should I buy DoD packs or buy adventure instead? (f2p player here)

The adventure gives extra card packs as rewards. No special cards, just the same type of packs.
However, if you purely count the pack value, you get less value for your gold. Just buying packs sets you back 100g per pack. The adventure is 700g per wing and you get 3 pack as reward. (Plus an extra golden pack at the end of all wings, if I recall correctly).

If you want maximum packs for your gold, buy packs.
If you enjoy the very different gameplay of the adventure, buy the adventure. Think of it as paying 300g for 3 packs and 400g for access to a fun game mode.
I personally play more solo adventure than ranked nowadays. I still love the mode. But that;s of course just a matter of personal taste.

Alright thanks for the suggestion