I would always work with the square drive using a conventional V jaw tap wrench and improvising when not possible. These make It easier to start thread square to tapping hole. Don't forget to break swarf off tap with a quarter turn back every full cutting turn though.
It helps to have a range of tap wrenches to best suit space available. Although I have one or two I've never had much luck getting enough purchase with the adjustable jaw T bar type.
