I love Boardwalk for easy access to HS & Epcot, and the staff there is just awesome (I've had issues with BC/YC), also several dining venues and great stuff to do at night (Boardwalk margaritas, ice cream, dueling pianos, multiple restaurants, plus you can walk to the other resorts in the area easily.... or take the boat if you're feeling lazy). I also like staying at Riviera since it's right on the skyliner, it's my husbands favorite resort, we've stayed there twice since reopening, especially great in December since the skyliner doesn't often have to shut due to rain. If staying in the MK resort area I like Poly, not a huge fan of GF but I know a lot of people like it, and also not a huge fan of CR but I do love BLT (don't like the room reno at CR, but can't beat the location). I do LOVE WL, but aside from the boat to MK it's not easy to get to any other park, I am staying there with my sister in December, but we aren't as concerned about that it's just my favorite that time of year.
I'm not a huge fan of Mods because they're just sprawling, either spend a little more for deluxe or save the money and go value, the rooms are about the same size and I feel like you're getting close tot he same quality for a smaller/easier to get around resort (and smaller price tag).