I'm sure some are wondering ,,,,,,,
All two-stage blowers have power to the big wheels and single-stage snow blowers need to be pushed, pulled, usually on small wheels.

2 stage snowblowers are glorious beasts that make an otherwise tedious chore fun. Singles stage blowers need to be shoved into the snow and at the pile at the end of your driveway you will sweat to death as you push and pull the thing in and out of the pile. 2 stage blowers drive themselves forward into the wall of snow and can be reversed with a flick of the switch.
I would have to agree though, that if you have a very small driveway like one of the 3 story townhomes then a small machine would be just fine.
See the difference here -
http://www.youtube.com/watch?v=FI-AFIA56yo