Both Bosch & Miele have a good reputation for reliability so you won't go far wrong with either.
My own preference with appliances is to go for a basic model of a good brand as there is less to go wrong if there are fewer bells & whistles, and most people only use one or two programmes anyway.
My last dishwasher was a Bosch which was problem free until it finally gave up the ghost after 18 years. I replaced it with another Bosch which I'm very happy with as well.
I admit I'd probably have preferred a Miele but couldn't get one in my price range.