More than 2.5 inches... go with Dewalt. Smaller size... you can get away with Ryobi.
i hate cordless power tools.
I refuse to buy any cordless tools they only let you down. In no time at all they are half the power they used to be and eventually they don't hold charge.
I am all corded now except the random cordless screwdriver here and there.
light work cordless is fine
I go with craftsman's cordless 20v li-ion shit, it's cheap and sears replaces the batteries with no headache.
corded I stick with dewalt and makita
you would, tesla