I did check the rental prices downtown vs. at the airport and it's not always more expensive to book downtown. No idea why, but sometimes rates are exactly the same.

So, not really much of a benefit unless we take a car from an airport - any airport, I guess. Which of the three would you think give us the best chance at finding a minivan in the EA (we will book full-size to be on the safe side) - assuming rental prices will be the same. Any particular day of the week or hour?