Meta: weird popping into this thread not realizing the original post is from 2014 and prepping to tell them there will be no holiday overlay this year.
To your question, @darkmite2:
TPM Vids did a video last week about WDW vs DL HM. His conclusion was that they are very similar but WDW includes a couple scenes within the ride that at DL are walk through before or after the ride, so he gives MK the edge. However, he mentions that the famous Hatbox Ghost is only at DL, so some people might prefer it for that alone.
Personally, HM has never been my favorite ride. I’m not really into spooky stuff (even happy haunts). But I enjoy the original version better than the overlay. The Nightmare stuff is ok - not too much, but kinda fun. The problem is it’s super popular so the lines get long.
As mentioned, it’s too bad you’re not going this year because they almost certainly will not be doing the overlay if they open this year at all.
(Ugh. I really hope my October trip happens or I’ll be a super grump for Halloween!)