I chose S&W because I have owned a few, and handled and fired several others. They are consistently good guns - accurate, reliable, durable, and often with very nice triggers. The people I know personally who own them, usually keep them. Also, they have maintained a good reputation for over a hundred years, with very few bad revolvers, during that time.
On the other hand, the Taurus guns that I have handled are good sometimes, and not so good at other times. I have seen more than one with rough machine work and misaligned parts in important places. I have heard about an equal number of good and bad reports from people who have owned them, and noticed that a lot of the folks who really brag on them don't really shoot them very often. Most of the firsthand bad reports I have heard have come from people who have put a lot rounds through them.
Granted that this is anecdotal information, and others may have entirely different experiences. But I will not buy a Taurus to see for myself, unless it is just too good of a deal to pass up, and then I will 'wring it out hard' to see if it is dependable.