I use a wireless keyboard, only because I am often moving my keyboard off my desk to do *work* on it. I could put in a keyboard tray (even have one) but meh, I'm fine with the desktop height of it.
I remember back in the day, it took a lot of batteries to keep one going but they've optimized battery life now such that all the (logitechs) keyboards I have, even with an extensive amount of typing, take too many months to remember when the last time was that I recharged the batteries.
Mouse, I insist on a high accuracy laser engine and corded because it is lighter and I move it only using my fingers, minimal wrist movement and no arm movement. I also take the metal weights out of mice to make them lighter still.
With tiny movements at high DPI, lag matters a lot more too so the last thing I can stand are modern battery saving circuits in recent generation mice, but by recent generation I really mean most made in the last 15 years or so. I'd rather swap batteries daily than put up with that.