Yeah I have been looking at AR pistols too. Just at the gun counter a few days ago. Mostly looked at the springfield and the ruger because it was what was in stock. I am wanting to stick with the 10" +- barrel lengths.

The saiint edge has folding sights but I do not like the collapsible brace. It has a little lever that will snag and is fine motor skill challenged. Further the rails are in the thumb space near the safety.
The ruger imo has a better brace and a trimmer forend but no sight(which i can remedy)
For some reason they used a non sandard BCG...wtf? I need to find out if they will run with a standard BCG.
Between the two I would go ruger but I am still lookin. BTW I got a buddy with a blade brace on one and it sucks. Slips an scrapes the buffer tube and get that sucker on your collar bone and not pleasant.