Advice wanted from those who have visited both parks, would you spend time at Disney World or Universal Studios/Islands of Adventure first in your trip? I thought my itinerary would mean I needed to do Universal first but I am wondering if Disney rides will seem to tame after Universal - or - if Universal would seem not as amazing after the Disney magic and attention to detail? I have only ever been to
Disneyland not either of the Universal Studios and planning first WDW trip so advice would be appreciated.
You don't mention the make up of your party, so advice can vary if you have kids or not (and how old they are). This is advice from a couple in their 40's with no kids, so bear that in mind.
Having been to Disneyland, Disneyworld and Disney Paris, the World is the best overall experience of them all. Call it magic, customer service or whatever, it's in a league of it's own in that respect. The other parks may have stronger themes (Cars Land), better rides (Paris' Space Mountain=INCREDIBLE)but the attitude of the cast members is just so different at World. If you are into Pin trading, nothing compares to the World. It seems virtually non-existent at the other two. I think it helps that it's pretty much a self enclosed Disney ecosystem. You will be shocked at how different it is compared to Disneyland.
Since you are not staying onsite at Universal you will be missing out on the single best resort perk of ANY theme park: the Unlimited Express Pass. If you are going at a busy time, your experience at Universal may not be the greatest as far as getting in all the rides/shows. The rides at Universal are not what I would call extreme, but they do skew towards an older demographic. The motion rides at Universal (Potter, Spidey, Transformers etc.) are fantastic and make great use of technology in a way that, while not "magical", is impressive.
So, which to do first?? If it were me going under your conditions, I would do Universal first. Why? Without the unlimited express pass you would be spending the last part of your trip waiting in a lot of lines and likely end on a tiring somewhat down note!! While the parks are smaller and close together, you will have to be pretty creative with your planning to get the most out of the parks in a limited time.
If you were to change your plans around and add an onsite resort stay for Universal, than I would reverse it and do Universal last. With the Express pass you will be riding everything (except Forbidden Journey of course) minimal wait times. Basically dictating your own pace and not have the park dictate it for you.
So that's my two cents!