makes them sound rather more up market, especially if you are charging them out at £120+ per hour.
say mechanic, think grease monkey
say technician, think highly trained & educated.
Technician: not the one who, for example, replaces the brake pads, he is the mechanic.
Technician: the guy (or as with our dealer: woman) who walks around with the laptop
to help the mechanic locate a problem. (She also has a USB stick with all the latest updates in a desk drawer).
She seems to be a real computer freak. In addition, she is also a nice lady...