We have at our current house an attached garage & I like this feature. Our last house was detached & at my parents, they have a carport. Definitely like the attached best. Easier to come in from the store.
Detached with a completely enclosed breezeway into the house so that you will never be exposed to nasty weather. And in the breezeway area somewhere have a mudroom and a small bathroom, so that the garage dirt and grime stays out of the house, and 'dirty' people can use facilities and wash hands without coming into house.
We have an attached garage that I love! It's a 3 1/2 car garage (3 bays and room for shelving and the lawn tractor) and it's so nice to unload groceries right by the door to the kitchen. Our former house had a detached garage and slipping on the ice up the stairs to unload groceries was the worst!