Which system is cheaper to install?

[Erica Nagle]

We've been told by a potential contractor (we'll likely GC ourselves) that forced hot air is cheaper to put in than forced hot water baseboard. This seems off so us so I wanted to check what everyone else thinks. The system would be brand new. There are existing radiators but we don't know if those can be used so let's say we can't reuse those. Anyone have any thoughts?