You may need to decide based on which one can carry that many people plus all your luggage plus a wheelchair.
Mears has wheelchair vans with a lift and tiedowns so someone can ride in the wheelchair while it is being transported. In the case of their wheelchair van, you would have the van for yourself, so you wouldn't be stopping at other resorts. The price is the same whether you use the wheelchair van or the bus.
Even though yourride has a 10 passenger van, there might not be room for the wheelchair, depending on whether (and how small) it folds up.
I'd suggest you do some calling or emailing and decide after you get the answers.