"Best" is subjective... One guy may really like the Glock trigger and another may prefer the DA/SA of a well-broken in CZ-75.
I like the consistency and short, crisp reset of my G19, but the best DA/SA was my Walther P99.
In my experience the CZ's start off gritty but wear in very nicely. Sigs DA/SA tend to be nicer than 3rd Gen S&W's, although I had a SP2022 that was pretty lousy (gritty and stacking). This seems to be the exception rather than the rule as most guys end up with a very smooth Sig Pro.