The Studios are closer to the Yacht/Beach Club Resorts.
From the Studios you can either walk (15-20 minutes) or take the Friendship boat (at least 20 minutes...more if you just missed one).
If you go to Epcot you will have to walk all the way through Future World and into World Showcase to exit at the International Gateway. This exit is very close to the Yacht/Beach Clubs, but it is a long walk through Epcot. It will also cost you an admission into Epcot to walk through. At the Studios you will not need to enter the park. The boat is to the right of the main entrance. The walk to the Boardwalk area (Yacht/Beach Clubs are across from the Boardwalk) is around the lake. If you are walking DO NOT head towards the boat. Stay on the parking lot side of the lake and just keep going.