in the past, my preference for mechanical gauges was the 270 or so degree sweep action, while the electric's, at the time, were limited to 90 degrees or slightly less.
today, if i were buying a new set, i would more than likely, choose electric. lots to choose from in almost any font you desire [and then some], and are as accurate as can be, especially the ones that use stepper motors in their guts.
i also like electrics as you can use a single gauge to monitor more than one item, such as using a temperature gauge to monitor two [or more] places by simply toggling a switch.