The Falcon is faster, both are predators for small mammals. I think the Falcon might have a higher appetite for meat, where the Osprey is fine getting fish out of the water.
I watched an Osprey take a massive trout out of the Deschutes River in Oregon, at least 20" while it was attached to my line and literally snapped the 6lb test line like it was a spider web while flying away.
That said, I think the Falcon is capable of like 200mph or something crazy like that. HELLO..
Doesn't matter on Sunday though. These are Seahawks...