I think there are pros and cons to both. The bottom line is they are two totally different animals and both are well worth the admission. Here is my feeling after visiting the parks recently:
WDW...Magical feeling that can't be replicated...all staff at Universal was wonderful, but something about WDW is just special.
I agree with PP that the rides just go straight to your heart in WDW. Leaves you feeling all gushy
Dinning in WDW is AMAZING....Universal needs to amp up and have more themed dinning. We did 6 Character meals/dinning experiences in WDW, not one I would complain about. Worth every penny.
Truly for all ages!! Universal is really for 5/6 and up. My 2yr old went with my mom and other family to AK while we were there. I am so thankful we let them take him. I couldn't imagine having him there all day...it would have been painful. Nothing really at all for little ones to do. Even my 6 yr old had to miss a few things, but still worth it!
Universal seemed to have a better resort feeling. Of course it being a lot smaller had a lot to do with it. Honestly, I wasn't impressed with the Disney "bubble". It has been yeas since I have been onsite so I kinda forgot what it was like. I personally, wouldn't have stayed at a value or mod after what I saw. I was curious because we were staying off site and did lots of exploring. We had a couple of non park days and we scheduled things at some resorts and even checked things out to see if when my youngest is a little older if we would want to stay on site. The values were a free for all and not clean IMO( I have seen people post they are glorified Motel 6's and didn't think that was the case, but now I can understand the comparison). They are just not worth the extra money when I can stay in a beautiful 6 bedroom home with private pool only minutes from the park.
I would guess we got there faster than anyone staying at a value and using WDW transportation. Driving and valeting at CR Start to finish was in MK in 20-25 minutes in the morning. If I did stay it would only be at the Poly, CR or GF These hotels were stunning(we didn't visit every single resort, but enough to get the sense of what each level has to offer), but with three kids I don't know if it is worth the premium price to get the 2bdrm suites and with 3 kids that is the smallest amount of rooms I would do.
I was even disappointed in POR, which is one I thought we would like after viewing online pics, but just wasn't impressed while touring when my kids were on the Pirate Cruise
I found the Boardwalk area to be wonderful at Universal...a nice perk to staying there plus with the FP as an added bonus think it is more appealing. Great restaurants all over, movie theater and all right there. No transportation needed. I didn't have time to check out any of the hotels there, so I cannot comment on the quality, but nothing there looked like it would be a value or a mod from the outside on the boardwalk. It appeared to be all upscale, but I know looks are sometimes deceiving.
In WDW the transportation is a nightmare. The lines for buses and monorail....no way, wouldn't do it. You are sardines. They don't really offer premium parking unless you valet at a resort and that is a disappointment.
In Universal you can valet your car and even pay extra so it is literally right outside the entrance when you leave. This is worth every penny when you have tired kiddos, to be in your car within a minute of leaving the park.
Not enough Thrill rides...though I don't think WDW really wants this. I love the roller coasters and the special effects at Universal/IOA is unbeatable. I will say the animatronics at WDW are way better than what's at Universal. Compare Dudley Doo right to Splash Mountain and it is kinda cheesey(and Ursula in LM...Wow she looked real!).