If you go to Epcot or DHS a lot, I vote Swan or Dolphin because I think it’s an extra 5-10m of walking to the Reserve each time you go to and from the room. If you have high status, I suspect upgrades at Reserve are better, but I don’t think it’s nice enough to justify 10 minutes a day of walking, let alone 20-40 if you’re a mid-day break person.
As a reminder, I generally won’t stay at VDH for this reason, would rather stay at the Courtyard Marriott across Harbor if I can’t swing Grand Cal…but I will occasionally stay at the Westin by DLR because those suite upgrades are niiiiiiiice (and unlike the hot sweaty armpit of FL, we rarely go back to the room midday).