Hmm, if you are talking about difficulty, from what I'm experiencing in Link's Awakening, I can, without a doubt, tell you it is pretty much easy, easily the less difficult Zelda game I've played so far. As for the Oracle games, I haven't played Oracle of Seasons, but I can tell you that Oracle of Ages is hard because of it's puzzles, as the game heavy relies on them. As for the ones who said to you not to play Oracle of Ages if you aren't a hardcore gamer, I must say I don't consider myself a hardcore gamer, and I'm in the last dungeon of Oracle of Ages without any help at all, though it probably is because I love puzzles, thus they're easier to me than to people who don't like them that much. Still, I would buy the three games and I would pretty much recomend you to buy the easiest one first, then the medium one and then the hardest one, which I think would be Link's Awakening-Oracle of Seasons- Oracle of Ages.
Hope I helped!