Get both of the Oracles. I'm biased since they're my favourite Zelda games, but even without that put into consideration, they're quality games that have good length and plenty of replay value, and I wouldn't want to miss out on the discounted offer (only reason I didn't buy them on the eShop is because I still have the originals).
If you do decide to get them though, I definitely recommend getting both. Each one is fairly different in terms of narrative and what kind of settings there are to explore, so I wouldn't be able to recommend one over the other if you just want to get one of them. And while I would consider them good games individually, the Linked storyline experience just makes them even better. So yeah, I recommend getting the full package with those games.
