We just moved from the SF Bay Area to Tucson, and found that the Sweet Tomatoes here is decidedly inferior to the one in Sunnyvale, CA. The variety and recipes are the same, but many dishes were "off" (not as delicious, cooked, etc.) particularly the chili, the ice cream, the muffins and the sweet potatoes. However, the diet cola and service were much better than in CA.
We also found that the food at the Chipotle on Campbell in Tucson was so tastier than at the two Chipotles in CA we used to frequent, and also better than the two other Chipotles here in Tucson that we have tried. I asked the manager why her food was so much better, but she said that she just uses the same recipes as the others.
Perhaps it's just coincidence - we'll keep trying them and see. Wondered if you've found any regional/individual differences in these chains?