I thought about installing the drop down stairs but I very seldom have a need to go up into the upper area of my barn so I have a 24"x48" opening in the center of the ceiling. I spent the money that the drop down would have cost on a 10 foot fiberglass step ladder. I have one of the drop down doors in another of my buildings. It is okay but I do not feel that it is very sturdy and I can do a lot more in my pole barn with the step ladder and the 24"x48" inch opening. I also have a 2 foot wide walk way down the middle of the attic made out of 3/4 inch OSB. This sure makes it easy to get around up there.
I do not remember what the price difference was and I did not do a lot of shopping around because I was working on a very tight time deadline but at the time is seemed like blown in was cheaper. The price can vary a lot between suppliers and it goes on sale once in a while as well. if you are not going to do the insulating until Spring you have the time to shop so I would do some serious price checking on the different insulation options and if the price is not that much different, I would go with the fiberglass because it is "sooooo" much neater, can be installed from below and has a built in moisture barrier. Putting up the 6 mil sheeting was not really that easy. Another thing I did not figure into the cost difference was the cost of the sheeting and I had to pay to rent the blower because my supplier's blower was broken.
Either way, make sure you and your helpers wear a face mask.
Farwell