I don't know the advantage of each but look at the availability of nails at local box stores, like Blowes and Homo Depot. Nothing worse than running out of nails in the middle of a project and not being able to get them on a Sunday or after 5pm.
I don't use a framing nailer that much, so I opted for a Craftsman similar to this, but older model. It had done everything I needed it to do, but it doesn't shoot some nails well. Usually the ones that have the paper strip on each side don't feed real well.
Different angles will help you get into corners better for toe nailin. I bought a Porter Cable about 5 years ago and it's been a good one, doesn't get just a heck of a lot of use (3 or 4 decks, a shower house, couple fireplaces, light remodelin, 1 barn finish out, etc.) but I've seen the same rig on plenty of jobsites. Ours is an FR350 I think....it shoots the full head nails, as opposed to the very similiar model (CR350 I think) that shoots the clipped head nails.
The clipped head nails are easier to come by at Home Repot and sLowes.
Don't know about the angles but I bought a full head nailer because I liked that thought better than the clipped head. like said above see what is readily avaiulable in the way of nails and buy accordingly.
If you are just buying one for home projects you can't beat the price/durability of the one they sell at Harbor Freight...28 degree "Central Pneumatic Contractor Series" air nailer currently on sale new for $75. I built a house at the ranch with one and never had a problem.
Pick one in no particular order with
1)the cost and availability of nails (extra nails can be stored so you don't run out when you need them)
2)the weight and ease of use(handability in toenailing, etc...)
3)how hard will it be to get repaired when it breaks down(o-rings dry up,parts break)
I am looking to get one, but.....
I see 18, 21, 24 and 30 degree guns....which one and why?
I don't really think there is an advantage as to the degree of the nail rack. Over the years most of the manufacturers have made different framing nailers that have shot most of the popular "degreed" nails. There is also sometimes the difference of paper-taped or plastic collated nails within the same degree spec. Some of the most common, late models are:
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