Both Conductor and TelePresence Server aren't being actively developed anymore, as they are only getting bug and security updates at the moment. The recommendation is Cisco Meeting Server as it's the conferencing solution going forward, there are some TelePresence Server features that it lacks at the moment, but Cisco is working on bring those over to CMS.
Take a look at the data sheets to read on what both conference bridges have to offer.
Cisco Meeting Server Data Sheet
TelePresence Server Data Sheet
Conductor isn't a conference bridge, but it is a requirement to run TelePresence Server.