I have done both and in my opinion the Illuminations cruise was one of the best things we have ever done. We were so close we could feel the heat from the barge. It was awesome, breathtaking and if you can do it - a not to be missed event.
Now - the Wishes cruise. It was nice - but they don't have something to dock to like in the Illuminations cruise so every once in a while because you are drifting they start the engine up and move - I found it to be very distracting. I also think you "feel" the Wishes show more if you are in the MK. I wouldn't do a Wishes cruise again unless the price really went down - like that would ever happen.
The Illuminations cruise I would do again in a heartbeat.
Sorry I don't have photos of either. It was several years ago when we did them.