Thanks much for all your comments. The last one in particular is very useful, comparing the specific Michelins to the specific Bridgestones, because those started out as the two top contenders. I can get the Bridgestones on sale immediately, which has an advantage in that I'm already noticing handling difficulties, mostly on turns, even in dry conditions. (I was advised not to drive in cold, wet weather!) I read the Bridgestone reviews and was a little concerned by some of them, but an actual experience comparing these tires on this vehicle is most useful. I will revisit the Bridgestone reviews and consider getting my tires soon. With a 30 day return policy, if I don't like them right away, I can exchange for the Michelin's when they go on sale. One reason I was leaning away from the Bridgestone tires is that I have Bridgestones now (Potenza, I think), and they only lasted 35,000 miles! But I noticed no problems until now, when they went downhill immediately. Traction is still good on the straight aways, with no slipping.
If anyone else has experience with the Bridgestone Turanza Serenity Plus, especially toward the end of its rated life, please chime in!