If you have a lot of experience with WDW and can go either way, I say mix it up and go to DLR!!! It is a different trip all together. I, like your DH, grew up visiting DL. As a teenager, I started going to WDW with my family, and that is were I took my DH once we were married (he had never been to either). I felt that it was the better of the two. We took our kids their a couple of time as well.
Then, in 2006, we took a trip to DLR. It was soo great! We all loved it, and for me, I couldn't believe that I had forgotten its pure charm! Now we go whenever we can.
We just took a huge trip to WDW, ten days in the parks and a cruise. It was great, we had fun, but we all agreed..we can't wait to get back to DL!!!
We are staying at the Carousel for the upcoming trip in May. I haven't booked for September yet, but I might try Priceline for that since it will only be my sister and myself. What is great, and so different from WDW, is that you can save money staying off-site at DLR and still be in walking distance of the parks entrances. Also, Park hopping is totally different. They are joined by a plaza, you just walk across from one to the other. DTD is right there as well.