Blizzard Beach.I'll respectfully disagree with the last part - I do think WDW has more options obviously in terms of entertainment, food restaurants/events , etc. however even after growing up with WDW I prefer DL now due to the size/ease of park hopping.
They are both completely different in the way they market to. WDW is definitely more of a resort experience where at DL it's easier to do more in less time and even with 6 days/5 nights in WDW I barely felt like we scratched the surface. It's much more hectic as you HAVE to plan it out if you want certain experiences and while I actually like FP plus , it has it's detriment as well.
Basically I don't think either is "better" just different depending on the experience you want.
It's often discussed on a forum I frequent and it's interesting seeing first timers to DL VS WDW and vice versa.
That's all I need to make DW better for me.