I choose WDW over DL because of the living arrangements and roles. I was going to do both and see what happened but I was advised that I would be better off just trying WDW. DL is a smaller park so there aren’t a lot of roles available and with living they don’t offer a place for participants to live, from what I was told you had to have a place of your own and they tended to choose people who were more local. Least thats my reason, a friend of mine that did the program last year told me about it and so I confided in her for guidence on the process (and still do).
Hope that helps!