Scooterman, I guess it depends on how much contact one coral has with another. In this case, you can pretty much bet the frogspawn will always win. I'd actually expect anything with nematocysts (stingers. Anemones, and many LPS) to win against SPS in a touch contest.
In this case, the SPS is now dead where there was contact. The best solution is to separate them, I guess. I have one location where a hammer coral (euphyllia anchora) has grown to rub up against an Acropora Cerealis. I've decided to make like the Beatles and "Let it be." The A. Cerealis now has a signficantly damaged branch, probably about a 1/4" of it is stark white and dead.
I also have a DMZ (demilitarized zone) between two SPS encrustings where it appears they've agreed to leave this hairline gap between each other and not touch. Neither has made a move over the other, ever, and they've been like this for almost a year.