I just finished my Alto and I noticed that the stickers actually look better than the decals most of the time. Except when they have to cover a dark surface like on the vertical stabilisers. Decals rule there. The stickers are just so nicely cut and have no excess decal paper. Only problem is that you have only one chance to lay them down and then thats it. If you have to take them off again they will never stick as well again.
So the decal positioning on my Ozma is perfect but they got destroyed after first transformation, Alto stickers not so perfect in some difficult places like the shoulders or places with gradients where the stickers wrinkle, but at least they are very durable.