Both are good dishwashers but Bosch is a long time favorite here. The latest Consumer Reports has Bosch listed in the top 11 spots.

As a servicer I own a Bosch dishwasher and highly recommend them to my customers when they ask about replacing their old one.

However, like all brands, you will find some Nay-Sayers.

Does your current kitchen-aid have a heating element to dry the dishes? My kitchen-aid does. It’s 18 years old and any day now will need to be replaced. I intend to get another kitchen-aid. Kitchen-aid and one other brand I think it’s Asko or meile, have a heated drying cycle. I do a lot of entertaining and need to have the dishes done quickly. I can get a short cycle on the new kitchen-aids. Most of the new dishwashers these days take up to 2 hours for a normal cycle and then do not dry.

most of us really don't need a heated dry cycle, nor. do I want it. 350 nights a year, I start the washer after dinner. on eco. an hour and 25 minutes on my bosch.
spotless dishes. best dishwasher ever. I love the third rack for flatware and very small items.

Buy either Bosch or KitchenAid: in my mind/experience they are pretty equivalent in performance and reliability. My general rule with dishwashers is to buy as simple a model as you can that still does everything you need. 99% of the time we use ours on one setting. The less complicated the electronics, the fewer things that can go wrong.

I had a lemon for a Kitchenaid and switched when it was about 4 years old because the electronic controls were shot. We got a Bosch and would never pick anything else.

I've had a KA now for nearly 16 years. I very much like the heating unit - do not want to have to "air dry" my dishes. I've had one service call - spring in the door broke.

Whirlpool took over KA circa 1986 but continued the KA design for several years until merging them into the WP PowerClean design (at the time). I had a 1992 KA that was still pure KA.

The first electronic-control KA was a "real" KA, a hybrid of an electronic touchpanel and computer board that operated a mechanical timer. It was known for problems.

Consumer Reports tested a number of Bosch dishwashers and found little difference in performance despite enormous differences in price. Two reasonably-priced models are the SHXM4AY55N and SHEM3AY55N.

I’ve had a Bosch for five years and it’s performed very well. I love the quiet 44 Dcb and its recessed opening mechanism. One negative about Bosch appliances is that many independent repair companies won’t service them.