>>23058744Honestly I would play Emerald over ORAS, personally.
While ORAS does have definite improvements like
>>23061831 posted, I don't feel they're worth as much as
>functional Safari Zone>60FPS with almost no route gates to speak of>Mauville isn't a mall, still has Game Corner>berry blending>fighting both Magma and Aqua>better Granite Cave like anon said>no Exp. Share/Amie/Super Training to make the game piss-easy (I know you can ignore them and I did playing ORAS but it just ruined my Y playthrough)>double battles with more than two Pokémon and better Tate&Liza battleAnd of course Gym rematches and the Frontier.
I feel Emerald offers a more solid game with great single player postgame, while ORAS is more interested bells and whistles like Dexnav (which is GREAT, don't get me wrong) and works to make the game more cinematic and story-driven, which is sometimes good and sometimes annoying. It also of course has online which is a big deal for a lot of people.
If you value a solid single player experience or hold postgame as important, and I personally do, I think Emerald is the better game. If you think it's better to play a more up-to-date game, like story over gameplay, or mostly only care about multiplayer, then I suppose you'd prefer ORAS.
I'm still hoping we get a Delta Emerald that brings everything from Emerald into Gen VI. Game Freak really dropped the ball leaving those things out in my opinion. 