I am looking to buy a snapper rear engine riding mower, but I am not sure which deck to choose. I am stuck between the 28" hivac and the 30" side discharge. I have read that you can bag, mulch, and discharge with both so what is really the difference. I have asked dealers and they tell me that they are pretty much the same only different in size. They have also told me that the important thing is the type of blade that I use .