Kenwood Chef...
I love my Kenwood, it has the planetary action of the Kitchenaid I used to have, and much finer control combined with a stronger motor and power transfer system. They were sold in the United States under the Rival brand name for a few years, if you see one, grab it, they are indestructible work horses.
I have always preferred the planetary action of a Kitchenaid or Kenwood Chef. I owned 2 different Mixmasters in the past, and loved the look of them, but was never happy with the results. Mixmasters require too much bowl scraping and other fiddling for my taste, and aren't nearly as strong and fast as a Kitchenaid or Kenwood. Just remember, in a Kitchenaid you have to shorten the mixing times, or you won't be happy with the results. Most complaints are because it is so easy to over mix items in a Kitchenaid. When I first got mine, I turned 2 separate batches of whipped cream into butter by accident, because I was so used to ignoring the old Mixmaster as it beat and beat and beat. In a Kitchenaid, it only takes a few seconds to go from sweet vanilla flavored fluffy whipped cream, to sweetened vanilla butter, (which isn't half bad on toast, lol).
I guess the main reason I prefer the planetary style mixing is that I grew up using hand mixers, no one in the family had a stand mixer until me, and now I have gifted them throughout most of the family. With a hand mixer, you are moving the mixer constantly, all throughout the batter, just like the planetary action of a Kitchenaid, which makes for much more thorough mixing than a Mixmaster trudging around in it's never ending circle.