I think the most critical part is understanding what your budget is, and go from there. For example, you might be able to stay in a deluxe with a garden view room versus a moderate in a preferred location for not much more. However, if you can afford TPV in a CL room in GF, that needs to be considered as well. I've stayed at the GF several times, and will be going back in February, I've also stayed at BC and YC and they are quite nice. Personally, I'd recommend staying in whatever the nicest room you can afford in Epcot, as that is such a great location for an adults only vacation. Just keep in mind the magic of Disney, when you get there whatever money you planned in spending disappears quickly -- it is very easy to upcharge everything there!
Best wishes on a lovely wedding and a long and happy marriage.
Tom