The Hobbs is a good thing if you want to build time or charge for it and the tach time is good for airframe and engine time. The Hobbs meter will show more time then the tach when you do a lot taxiing and stop and goes.
Doug
I have been flying 35 years, so I am aware of that.
That is because you are flying rental planes.
FYI: I fly 4 different aircraft regularly, one of which belongs to my family, and several more occasionally, none of them are rentals. Of course, some may have been at one time.