I remember someone telling me that PSA likes to see a focused heel, but that's the only difference I am aware of... not to say there arent any more differences, because there are... but thats one that always stuck in my mind lol. As for a Pro of PSA... more recognition, more training and trialing opportunities nationwide... ASR and PSA should merge lol. ASR seems to be primarily concentrated in the south east and further up the east coast, no real national recognition, certainly no international recognition beyond people who see it mentioned on message forums.
The words Amateur, and Joke come to mind. PSA is becoming more and more like Mondio without the control in some areas. I watched ASR, then I watched as it's BIGGEST spokesperson left and went to FR. Something fishy I guess.
To clear the air Chris left for FR to try something new. He didn't want to get nailed down to one sport. Chris is still very much involved in ASR. As for ASR and PSA merging I don't think that will every happen to much drama in PSA for us.