If I had to guess, I would say the Titan SC is going to complete a task faster than the F@H network because all of the hardware is connected locally and it is acting as a single machine. The F@H network is bottlenecked by each individual system's internet connection upload speed.
Had that feeling. But what if the F@H network had some super speed connection which sent data as fast as the local system of the Titan?
I guess what I'm asking is how fast would 3.5ghz x 280000 be and 2.2ghz x 18,688 be.