So pros and cons for all of them depending on what you want to do. If you are spending the majority of your time at MK, then the Contemporary or Grand Floridian best fit the bill. Our personal preference is the Grand Floridian, as we prefer that style over the Contemporary. We also enjoy using the monorail, and even if we would stay at the Contemporary, would probably not walk back and forth. They both have similar amenities, though we also prefer the restaurants at the Grand Floridian (V & A's is our absolute favorite!). The con is that people have reported that bus service to the other parks can be spotty, but we had no problems with it from the Grand Floridian.
If you might be spending more time at the resort, then the Beach Club 1 bedroom with Club Level is the way to go. It has absolutely the best pool complex in Stormalong Bay. Having access to the Club Level is a nice perk. So you are also within walking distance to 2 parks in EPCOT and HS. You also have the Boardwalk, Swan, and Dolphin a short walk away with more restaurants and shops close by. There is a really nice putt-putt golf next to the Swan, also only a short walk from the Beach Club. And of course, it is nce to have a bedroom all to yourself. My wife and I are DVC members, and even if it's just the 2 of us, we usually opt for a 1 bedroom unit. Oh, a minor correction. Someone previously mentioned the washer/dryer in the room. Sorry, but only DVC 1 bedroom units have the washer/dryer. The regular Club Level 1 Bedroom units do not have a washer/dryer.
Good luck!