Mears RT or Mears/Towncar?

[Disneylvr]

We are flying standby in just 4 days to Orlando. Since we won't know for sure what time/flight (or day for that matter) we will be arriving on it is impossible to make a RT reservation with a towncar service so we will be using Mears from MCO to All Star Sports although I much prefer the towncar services. But for our return to the airports I could either use Mears OR a towncar since I will simply want to arrive at the airport early in the morning to get on the standby list. I am trying to decide between purchasing a Mears RT ticket or use Mears and towncar one way each. Any opinions? Right now I am leaning towards using both Mears(arrival) and towncar(departure).