Make sure whatever brand you buy, that t has a switch to go from single shot to auto. ie: hold the trigger down and when the nose touches the work it fires. ONLY WAY TO USE A ROOFING GUN!!!!! Framing would likely be OK as a single shot.

Be verwy verwy careful, (sic) THESE TOOLS CAN BE EXTREMELY DANGEROUS!

Forget the nailer.
If you want your projects to be solid and stay solid, use construction screws most have the T25 heads. Get a good drill and go crazy.
Sizes for everything but shingling.

Osky

My gun is air operated. I have used battery powered metabo and Milwaukee guns. The advantage of battery is no air hose to drag around, the disadvantage is quite a bit heavier than air guns.

Hitachi is now called metabo. Same company/guns different name.

As stated before stick with screws or at sometime you’ll be sticking to the boards.

I use the rigid air nailer with no complaints.
Big fan of ring shank nails

I think i have 9 guns, pneumatic and Milwaukee battery. Pneumatic would be good if you already have a compressor. If not, batteries are pretty good. Framers are helpful with 2x material. 1/4” crown staples are good for smaller material/sheathing. 15 18 and 23 all have there places too.

Screws have their place but they are brittle and tend to break, especially if they corrode. Nails bend and will last longer through tougher conditions

Most screws are not rated for shear. If you are framing, use nails.
As for nail guns, as a retired general contractor, I have gone through dozens of nailers, from little brad nailers to roofing guns to framing guns.
I recommend then Hitachi guns for serious framing. They are top of the line and last for years and hundreds of thousands of nails, if properly cared for and oiled regularly. You may have to replace a seal after the first hundred thousand nails.
If you are just doing an addition, or even a couple of houses, you could probably get away with a Home Depot Rigid nail gun, or similar.

I'm just building some animal enclosures , cabinets ect

I mean that's what i do already