I have to vote for OKW ... the extra floor space was really wonderful for our little ones. We drove the couple of times we stayed there and I was able to bring plenty of toys and stuff. Also, the laundry room is the perfect size for a pack 'n play so it was like having an extra bedroom ... wonderful for when my daughter (14 months at the time) needed a nap because we didn't have to worry about making too much noise!
You didn't say what size villa you were getting, or the ages of your toddlers, so that could also play in to the decision.
We did OKW with DD @ 14 months in a 1 BR, with DD @ 2 1/2 and DS @ 9 months in a 1 BR and then moved to a 2BR for the next trip. Since then we have stayed at VWL becuase of the proximity of MK.
Love OKW because of the extra square footage and the layout of the kitchen and dinig area ... much easier to move around in and get highchairs around the table.
This being said, I think you will find wonderful things about all of the resorts!
Hope this helps! Jennie