I am a HUGE Disney and HUGE Halloween fan and I was so excited to do Mickey's Not So Scary and Universal's Horror Nights last year. We ended up missing Universal because the danged hurricane closed the parks down for the one night we had our ticket for, and I am still so sad about it - especially because we DID get to do Mickeys and it just wasn't... as amazing as I wanted it to be. The parade was nice, but I was excited to see rare characters (queues a mile long) and get the fabled BAGS of free candy. There was a lot, but it was all just the same old stuff we have over here - Snickers, Mars, whatever. I was so excited for American candy, we stopped bothering with the bags after the third batch of same ol' same ol'. Like, the event was nice and the atmosphere was lovely, doing the rides at night (some had a small new overlay for the evening), but we won't go back unless they REALLY change it up.
...whereas Universal has different houses every year etc. Way more bang for your buck, I think - not that I got to see it myself