The Value resorts only offer a food court and pizza delivery. Away From Home resorts are varied, as each addresses a very different clientele. Recreation Health club and recreational facilities vary widely between resorts. Some Deluxe resorts have world-class health spas and extensive health club facilities. Most Deluxe and several other resorts are graced by tennis courts, and the majority of resorts have some sort of marina with a variety of water craft available.
Every resort has at least one pool, and some have pool complexes reminicent of a water park.
Most do, but there are exceptions. Guests at other Disney resorts can generally also take advantage of the facilities, but you still have to go out of your way to drop the kids off and pick them up again. A final factor in your choice may be discounts or special needs. This site gives a good rundown of what to expect. When it comes to saving money, if you're a Magic Kingdom Club member, hold an Annual Pass, or take advantage of other discount programs, you can make a decision based on what deals are offered.