Dat. It can be extremely annoying to train EVs (SPECIAL DEFENSE!!!!!). But it's worth it.
I wouldn't say IV are better, but i guess what i can say is: It takes a while, but there's a way to manipulate natures in the game, there's a way to manipulate abilities, and EV training is "easy" to do if you know what you're doing.
Since there's no way to manipulate IVs in the game (And as Ame stated, there's probably not going to be a way to manipulate IVs, ever), you should soft reset for IVs. The rest, you can do something about it in the future.
I'm going to say this though: There's no need for breeding, soft reset or EV training in Reborn. It's going to be tougher, but you can still do it. What you should really care about is grinding, i guess.
Although, iirc, there's no way to put more than 85 EVs in a single stat in opponents pokes right now. If Ame (Or Guardian) figure out a way to do so, EV training might become a bit more important. MIGHT.
EDIT: I don't remember any posts to confirm this last statement, so yeah. I could be wrong. I wouldn't be surprised if i am.