I'm looking to purchase an aerator and looking for information on options. I have a John Deere 2305. What are the pros and cons of a aerator that hooks up to the tractor vs. a walk behind? How much difference is there in price between a walk behind and a tractor model? Doing a site search I've read several recommendations on walk behind aerators, but very few on tractor mounted aerators. What models are people using for a tractor the size of the 2305 and about what did they cost? Thanks.