If you don't have any maps (ie. TOPO) to load from the Mac to the Zumo, you're basically limited to being able to transfer tracks, waypoints and routes from the Zumo to the Mac and waypoints/routes to the Zumo.
BaseCamp is really useful only if you have the TOPO map DVD.
I have no experience with MapManager and MapInstall but I'm pretty sure these are subsets of Road Trip.
The better question might me, what do you want to be able to do?