Which resort is most, convenient, spacious, nicely decorated & overall comfortable.
I've only been to WDW once & stayed at OKW. Love the spacious layout & sense of relaxation.
To us (regular rooms, not villas/DVC):
Most convenient to MK = CR (there is a walkway)
Most convenient to Epcot & HS = BC, YC, BWI (there is a walkway)
Most spacious regular rooms = CR, Poly, and GF (all monorail resorts)
Nicely decorated (favorite theme?) = Poly or GF (personal preferences)
Overall comfortable = Poly, GF, BC (personal preferences)
You mentioned loving OKW for spacious layout and sense of relaxation. We have that feeling at Poly. It's very tropical and relaxing. Also a monorail ride away from both MK and Epcot, great views of Castle from Poly, great restaurants and pools.
However, quickly climbing up the ladder to the top with Poly as our favorite is the GF. We've only stayed at GF one time but it was enough to lure us in. It's extremely comfortable (beds are awesome) and we felt pampered there. Very, very relaxing. First monorail stop to MK, and first boat stop back to GF.
If you're looking to be near Epcot and HS, then BC is our favorite Epcot resort. You can walk to both of those parks. Rooms are very nice, restaurants are great, pool is among the best in Disney.