Note: I have still not seen Kung Fu Panda.
Exactly opposite in my opinion. The reason How to Train Your Dragon was great was that it wasn't a comedy like other DreamWorks movies. Sure, it had some jokes, but it was mostly an action-adventure, which made it amazing.
I also agree with the Cloudy with a Chance of Meatballs and Despicable Me being closer to Looney Tunes than DreamWorks movies. Even though both those movies do rely on references at points, a majority of the comedy is slapstick or wordplay.
So yes, I think Pixar is funnier than DreamWorks, for two reasons. The first would be that I laugh at multiple different viewings at jokes in Pixar movies (i.e. Toy Story 3,) while, with DreamWorks, if I laugh at it once, which is rare, the next time I see it, I will either smile or not even notice it. The second reason is that I can laugh at Pixar movies right after emotional scenes, (i.e. Toy Story 2/3, Up.) After Ellie dies in Up and I'm crying, I start laughing at the Carmen montage. Heck, during the now famous "Goodbye, Andy" scene, I laughed at one of the lines through sobbing. It's just amazing their movies literally follow the famous quote, "For every laugh, there should be a tear." And, moreover, vice versa.