As someone who sells Kitchen Aid, Bosch, and Magic Mill, I can say with certainty that the Bosch outsells all the others by far.
Those of you who are getting a good deal on Bosch mixers from the internet, just know that they don’t come with the Stainless Steel Bowl which you’ll need for Challah. To buy the bowl seperately will cost you in the area of $125.00 or even $150.00 (or more.)
For those who don’t find the Bosch good for the heavy cookie dough, they have for sale a cookie paddle set that comes with a metal cap, that should take care of that problem.