The Peace project has mostly “punched” openings that need stud walls to be erected before the windows can be placed into them. FNB is pretty much a uniform curtain wall… after the slabs are up, they can go straight up the building with curtain wall.
Also, judging from this photo, it looks like FNB is using a unitized system for at least part of the facade. This can be installed in 1/3 of the time of a stick-built system, because the curtain wall is prefabricated in modules and glazed at the factory and then hoisted onto the building, as opposed to being constructed and sealed pane-by-pane at the construction site. A unitized system is very rare for Raleigh… I only know of the SECU tower and RDU terminal 2 that have used one, although I’m sure there are others.