Air is awesome, really powerful if you get a decent one (forget the entry level one) You need a compressor and if you bring it somewhere else that don’t have the same fitting… you can be screwed.
No access to air .. no impact
Battery operated. I have a 3/8 one and i’m fairly happy with it. It seems every year what they come up in manner of better battery autonomy and output power is getting better. Being said I worked 8 year in the trade before purchasing a battery one and I would suggest you to wait that will be your first impact. It’s nice as you use them everywhere as long as you have access to electricity to have a fresh recharge pack as soon as the first one give up. The 1/2 inch one are pretty good as you can remove wheel nut.. but removing wheel nut on a dually (140ft/lbs and over) will be the ultimate test, especially if they never been service or start to seize.
I used a dewalt electric to do a wheel bearing on a malibu and was impress as I didn’t expect to crack the axle nut free. The size is what kinda sucks, but they are made for construction work. You can use as long as you have electricity, at home, camping if you have a generator 😉 I would consider one if I was camping with a pickup and fifth wheel to replace a flat on the size of the road…. Our tire guy actually use them as they have a floor for themselve and it pass the test. You will get constant power over a battery one.
If you have a compressor at home, I would go air impact first for 1/2 inch anyway. If you want 3/8 you could go with battery .. there is some sweet deal for 1/4 and 3/8 bundle.