Depends on what you want to be convenient TO. Many would say the monorail resorts because of the ease of the monorail and proximity to MK. But if your favorite park is AK, the monorail resorts are not that convenient for you.
IMO, the Epcot area resorts (Boardwalk, Beach Club/Yacht Club, Swan/Dolphin) are among the most generally convenient. You can walk or boat to two of the four parks, and they are centrally located so they have relatively easy commutes to MK, AK, and Disney Springs. You can also walk or boat between each of these resorts, giving you more options for dining and entertainment.