Your observation about selection based on instructors' comments makes sense. You also have clearly made the point about confidence in the weapon selected IMO.
It's too bad you are restricted to "Double-Action Only in the Sig. The DA-SA version makes the most sense, in my experience. The issue is practive time.
As I said earlier, Mr. Glock doesn't want to hear about problems with his guns, which has substantially contributed to the NYPD problem requiring too much time to correct. If an officer is killed due to his/her weapon going "phase three" I expect Mr. Glock will be facing a substantial lawsuit.
From the top article:
"To correct the problem, the Austrian-based Glock company has sent engineers to the NYPD's firing range at Rodmans Neck in the Bronx. Since June, they have repaired 3,200 weapons in a procedure that takes about an hour. Immediately afterward, officers tested the refitted weapons at the range, where the results have been excellent, Collins said. The process will continue until all 24,000 Glocks are fixed, he said."