Herself says her Bosch mixes the heaviest doughs better than their most powerful Kitchenaid Professional 600 home mixer that she had. Her Bosch is more stable on the counter while mixing and yet a half the weight of KA. This is her personal experience not a paid ad.
That said, I've learned to trust her judgement on all matters kitchen related since she is the one who bakes every day. DEFINITELY form your own criteria list and test both at a cook specialty store. Ignore the fancy colors and watch each one operate while listening for any struggle from the motor.
Happy hunting.