It's all about what you want, if you are concerned with resale, only a car person is going to like a detached garage, others just want 2-3 cars connected and has an entry into the house. We ran into this in selling our house, our 2 car was attached but did not enter into the house, it had a door on the porch. The fact that the garage was attached but didn't open into the house directly was complained about with more than half of the people when they left feedback. (every showing leaves feedback) we had 32 showings. In this day, I would never buy a house with a 1 car, it's becoming more common with new builds that 3 car is almost expected.