Hmmm park hopping is always going to be my choice and I'll tell you why:
When I was about 13 my parents took me to WDW and our first day in the parks we spent at MK and really soaked in the disney spirit, checked out the magic shop (I miss it terribly and now hate plush), ate dinner at the Liberty Tree and then my parent's suggested we head to Epcot. We were like, "but we're here now, this is the park we chose today" but it was 1988 and the park hoppers were in effect so we hopped onto the monorail and glided into epcot as the sun was setting. SSE was aglow with purple lights, future world was buzzing and it was an extra magical time, we were in WDW!!
The year of a paper route saving to buy my brother's and my ticket (part of the deal we struck with mom and dad) was paying off huge.
We hit some rides and then we started around world chowcase, got an ice cream and then, out of nowhere, Illuminations started and we enjoyed the show, not knowing it was supposed to happen (btw it was the old illuminations with the 1812 Overture synchronized to the big BANGS, made me a super fan of Tchaikovsky). WELL, we headed back to the resort after that and decided Park Hopping was the way to go.
Now with a 3 month old daughter I hope to share some of the same experiences with her. Park hopping is what, in my mind, makes it Disney WORLD not Disney Parks.