Not sure how big a double batch is, but the Bosch Compact is a real workhorse in a small size that can handle any type of dough. I have not made cookie dough in it. The best range for the Compact for really wet doughs ( 85 % ) is 450 grams to 1000 grams, though it will handle even smaller dough if you need to. The Bosch Universal Plus is also a brute, but it may have trouble kneading small wet dough - if you made a single batch of say 400 grams of 8% hydration, it may not be able to knead it. On the other hand, you can load up with lots of flour and it will work well.

After replacing two KitchenAid Pro 600 stand mixers due to not being able to handle my bread kneading, I went with a Cuisinart 7 Qt. I love it! It handles even large batches of whole wheat bread without straining. I gave the last replacement KitchenAid to my daughter.

The first two KitchenAids expired during the warranty period, and I have to say that KitchenAid was great about honoring their warranty, but it was a real pain being without a mixer while waiting for the replacements.

I burned out a KitchenAid or two kneading bread. They told me it was because I was using too high of a speed. I have not had trouble once I switched to 3 or 4. It also no longer wobbles terribly when kneading, so hopefully I won't take any more chunks out of my floor then it shimmies off of the counter.

Kitchenaid Mixers Burn Out. I'm on my fourth KA. My friend has the Bosch Universal Plus. It has suction cups on the bottom, a domed lid and can knead 15lbs of dough! Bed Bath Beyond has it and you use ur 20% coupon, $320+tax. The cookie blade is $35. Good luck!

OrchidSlayer, if I recall correctly, KA say no more than speed 2 for kneading stiff doughs.

I have the Bosch Universal Plus- it's totally awesome! Also in its class is the ankarsum brand mixer; but it is pricey! Good luck!