Gary;
I would say it depends on your application/location. If you live in an area with little snow, a blade would be fine (and cheaper) If you have moderate snow+, a blower might be better to throw the snow farther away. And, if you have a narrow driveway you don't want to keep packing the snow closer in with a blade.
Given the fact you have a lawn tractor, you will be limited by how much deep/wet snow you can throw OR push. I think more snow you'd be much better off with a blower, but you'd just have to go slower in the deep/wet stuff. Chains and rear weights would be strongly recommended.
I personally use a blade, but in front of a Cub sub-compact 4X4, so it goes thru nearly anything. I think a blade is more fun, and quicker. But if we have LOTS of snow....I have the cab and blower ready!
For used stuff, look on Craigslist or Ebay. Good luck!