The bus is easier - you can't get the monorail to Epcot from the Contemporary, you'd need to get the boat to the Contemporary or MK, then a monorail to the TTC, then the monorail to Epcot.
Or, you can get to the MK, take a bus to the Boardwalk, and go into Epcot the back way (if you want to start at WS - or even if not, since the back way is usually much less crowded to get in).