I've not decided yet. Usually I would buy the bigger bundle, but unless you're into cosmetics and golden cards, the smaller bundle of 60 packs and two legendaries for 50 USD seems like a better deal. Due to the reward track, I have way more gold than I'm used too, so I would be fine with fewer packs. Then again, you don't get the Battlegrounds perks with the smaller bundle, so I would have to spend additional gold on those... It's also the first expansion of the year and thus the one that will stay in standard for the longest time, and I do like the hero portrait, so I might end up buying the bigger bundle afterall. Decisions, decisions. I will NOT be buying both, that's too expensive for me.
Tl;dr: The smaller bundle is probably the better deal, but I might buy the bigger bundle anyway because of Battleground perks and nice hero portrait.
I think the same, but I do like to play a few games of BGs, and after not buying it for the first couple of months last expansion having the pass makes such a difference to the BGs experience.