I have seen a back to back comparison dyno test on AFR 205's and TFS 205's. Both were very similar in power. I think that both were nearly identicle to the top end of the tach where the TFS ended up with a peak of about 5 to 10 hp better but IIRC the AFR's had slightly better numbers in the lower rpm's. They were so close I would probably use the cheapest of the two because you wouldn't be able to feel any difference. The test was in one of the mustang mags I don't remember which though.
BTW, Very nice comparison between the heads alot of time went into this. The only thing I see missing is the TFS 185's