I started logging using hours and minutes, as that was how my first flying school logged.
Changing schools, they used hours and tenths of hours, which just made more sense to me to use.
It surely adds up easier, and because you round, you are rounding UP, which actually squeezes a little bit more time out of the aircraft. It works out that I might gain an extra three or four minutes out of a flight at times.
Also, the Aviation Theory Centre logbooks have a table inside the front cover to convert minutes to tenths of a hour; saves brainwork after landing. If your logbook doesnt have this, spend five minutes one rainy day writing one up inside your own logbook's cover.
Every six minutes you get another point one of an hour.