I don't have personal experience with the Alteras, but I do know a handful of people who have them. I have evo3s myself.
My experience with the evo3s is that it can be a bit of a pain to lace them up each time, but the ankle support I get from them is great for the rocky and log ridden entries we have around here. I did have a problem with the soles coming off (close to 300 dives though) as they're only glued on. A big improvement would be to stitch the soles on as well, then the evo3s would be solid. I've found that grommets come off quite quickly as well, but it doesn't really matter. Over all I'd say that Evo3s are the better choice, even though can they be a bit of a pain to lace up and to get out of if you don't loosen the laces enough.
Now I haven't used the Altreas, so take this as you will. They don't look like they provide the same support as the evo3s, but they do look much easier to get on and off. Same problem with the soles from what I've seen . The first comment I hear from people who get the altreas is usually "these things are great!" followed by "damn, i should have got the evo3s" a few weeks later. Apparently the hook doesn't always stay.
If you're doing a lot of shore entries covered in ankle breaking rocks and the likes then I say go with the evo3's. If you're walking in off a nice sandy beach or jumping in off a boat quite frequently you may be happier with the convenience of not having laces, but either one will suit you in that case.
Hope that helps. Good luck with the fusion, i'm considering getting one myself.