Not hard to tell how effective DA/SA is. Just look at all the top pistol competitors and special forces units who choose it!
(Can you say ZERO?)
Top pistol competitors shoot for a living. They are sponsored by a particular company and are paid well to shoot what they are told. Jerry Miculek would shoot a Taurus if they paid him more than S&W does.
Special Forces uses the Beretta M9, the SIG 226, and the special forces in other countries still shoot a TDA gun. Or do you think a Nany SEAL with a SIG is at a disadvantage over Joe Mall Ninja with a Glock or an M&P?