You can search and search, but in the end, it comes down to what you feel comfortable with doing as far as actually building the building yourself. There is a price difference, but in the end, both equal out to within almost the same price.
A lot of people feel more comfortable with a pole barn type of building. In going that way, it eliminates the footer and foundation. If you go that route, when it comes to insulating and finishing off the inside, whether it be drywall, OSB, or tim, you almost have to build a standard wall between the poles. With your typical wall, you are building on top of either a slab, or you will have a foundation down to your "frost line" setting on a footer and a foot, or a few feet above ground. A proper footer and foundation can run a few thousand depending on the size of the building.
I've never built a pole barn but have helped out on a couple of them helping to set the poles. To me, it's more challenging doing that, than it is to build a wall and setting it on top of a foundation. My biggest hangup with a pole building is getting the poles spaced correctly and having poles that are not going to twist and turn before you start covering them with OSB or tin.
When first starting out though, if you get good lumber and have some common sense, getting just the framing up for a pole barn will be cheaper. Where the money starts to come into play is the insulating, what I mentioned about basically building a standard wall between your post to finish off the inside, and your concrete pour.
So it's more what you feel comfortable with. I want to add on to my garage and I have been kicking around the idea of building the addition as a pole barn style addition. I've built covered decks a number of times and never had a problem doing it, but the idea of building a pole barn sort of intimidates me. I don't know why, but it does.
Good luck and be sure to post up whichever way you go.