I would say that less than half of the FedEx flying is considered daytime, but it's kind of weird day flying. For example, there are alot of flights that leave MEM at approx. 4 pm, go to a destination and sit for a few hours, then return to MEM at about midnight. There are some flights that leave at 4 pm, then layover at a destination overnight and return first thing in the morning, and then you do that again at 4 pm. With those, you wind up having several hours in MEM at the hub. To long to stay there and to short to go home type of deal. However, they are still better than hub turning. For example, leave MEM at 3 am, fly 2 hours to ATL, layover and sleep all day until 10 pm, leave for MEM, arrive at midnight, then sit around and wait until 3 am to leave for ATL again. I'm in the 727 so these are what I see. The widebody guys do things a little different, I think they have less hub turning.
I would take the flying where I am in a second over the pax flying, especially now with the craziness at all the airports. As far as the pay goes, it's less than the Big 3, but, since I've been here less than a year, it beats what I would be making if I was at a Big 3 right now (i.e. on the street).
Good luck