Lithium ion vs Air

I think to have both options is best. But like Rusty says going cordless is T&A. Buy a good one at the start. If you go cheap you'll likely be soured on cordless. And if it doesn't meet your expectations, just take it back.
I just hate changing flats on the interstates with four ways and breaker bars.
I take my 1/2" Dewalt cordless impact anywhere I tow the boat. Seems stronger then the Jegs or Craftsman impact. I gave the Jegs to my "bow tie" brother.