They're both British bands that make very technical pop music. I think that SFA fulfill the promise that Radiohead has. They know how to cross genres within the pop formula and remain surprisingly coherent and tasteful, while retaining a sense of humor and, occasionally, emotion. I guess they haven't released an album as coherent or masterful as Radiohead's best, but I prefer their discography.
I got off on trolling threads about SFA because I actually used to get angry when people dismissed them as a cheap gimmick act whose one second was up in 1997. I'm older now, so I really don't care. It's just funny to bring up. Plus, I like talking about SFA. They're a fun iband.
There you have it.