The difference isn't really a big deal unless your driveway is 200 feet long! So the larger clearing width may only save you about 10 minutes versus making your snow blowing time much more comfortable and convenient.
Focus on the Features
You want to look at features such as power steering, heated hand grips, automatic chute control, and larger engines.
Power steering saves you from having to make wide turns in the middle of the street or horse it back-and-forth to change directions. It provides better handling, so more members of your family are capable of enjoying the benefits of a snow blower.