We were lucky enough to do both cruises last trip. It was DH, DS10 and DMom. Both are great and have certain things about them that we like. Wishes - see the water parade by the WL before seeing Wishes, nice view of Wishes over Main Street buildings and train station. IllumiNations - boat "docks" under the bridge by International Gateway, it's a great view, comfortable seats, can sit back and relax and see people crammed around the railings along the lagoon.
We were fortunate that the breeze was pushing the smoke in the opposite direction for IllumiNations.
DH likes Wishes one more. I think it's because Wishes was more private. And Illuminations you have other boats right next to you.
I prefer IllumiNations cruise because you're right there and I love the lighting of the different countries. It's quite loud though, since you're so close.
BTW, IllumiNations cruises book faster than Wishes ones.