1 car side garage vs 2 car backyard garage on long narrow lot

[Barry Smith]

I am remodeling a property I recently bought and am interested to know what everyone thinks about the property value impact of building a one-car detached garage on the side of a small 2/1 house vs. a two-car garage in the backyard. 

A one-car side of house garage would fill in unused space on the side of the house and leave a much bigger backyard.

A two-car backyard garage would obviously hold two cars and/or more storage but would cut up a lot of backyard space and make the space on the side of the house useable only as a longer driveway.

Any thoughts on which might be better/worse for property value would be greatly appreciated!