Contemporary garden wing. You won't have to worry about unpredictable Disney transportaton getting you to MK on time (assuming that's your favorite park), and you'll have a comfortable place to sleep and shower every day. You also will get to skip the hour+ monorail, bus or boat line&trip home after the park closes each evening. The time you save will give you more energy for the parks. Never underestimate the ability of a long commute to & from the parks to add to your fatigue each day.
If you're more partial to Epcot or Hollywood Studios, then I recommend Yacht Club, Beach Club, or Boardwalk Inn. Nothing, and I mean nothing, beats being able to walk to and from your favorite park.
I disagree with those who say to stay value because you'll never be there. On the contrary, you'll be exhausted when you return to your resort, so you'll want the comfiest bed possible, which you won't get at a value. A few years ago we stayed at Pop, and were at the parks all day every day. But we still had to go back to the Pop every evening, and we didn't look forward to it. The exterior of Pop is cute, but the room was uninspired to be polite. It was like staying in a motel (not even the cleanest motel) and I don't recommend it to anyone. We enjoyed tent camping at Fort Wilderness a lot more than we liked staying there. It's better to stay offsite than to stay value, in my opinion.
I'd like to add that since you'll be there for 8 days, it's likely that you won't be opening and closing a park on every single day of that 8-day trip. You'll find exhaustion overtaking you by day 5 at that pace. It's very likely that you'll end up giving yourselves at least one day or half day of down time toward the end, just to maintain everyone's sanity. You'll really appreciate being in a deluxe then.
