We're flying in Saturday morning and then returning home the following Friday, so we're doing one way rentals before and after the cruise. We've done both the
DCL transfers and rentals (both one way, and when we got a bargain weekly rate parked @ the port). The rental is convenient because we can make stops to stock up on cruise items (beverages, etc) to take onboard, go out to dinner, and so on. I'll drop everyone off @ the DCL terminal, return the rental, and catch the shuttle van back to meet up with the rest of the gang.
The DCL transfers are convenient if you're going between the airport / WDW / Port Canaveral.