Pfffff, I feared this would be happening.....
Is English a better language than Dutch ?
Is brown a better color than blue ?
It's just all what you are used to. I also use the "system" that comes in as the most handy for the job (but only since I started this hobby, I have to admit, hence the " tape measure).
Actualy, there are laws that rule out the use of certain measuring systems. Let's take TV's. TVs diagonals have always been indicated in centimeters here. However, when computer monitors arrived, the diagonals were indicated in inches, even here. In Germany, there is a law that it should be indicated in metric in adverts, shops etc. Luckely, we're a little bit more relaxed (in some ways) here in Holland, and I see about everything used, " and cm.
But when you ask me, how big is a 19" screen, or how big is a 25" screen, I have a FEELING of about how big it is. I had to calculate back to know what second hand TV to get to use as a 19" monitor for my Galaxian !!! (And I even messed up with it, getting a 55 cm first, while it should be 51 cm. !!!)
The only thing I would say is better about metric is that everything is 10 based. We have 10 fingers. That's why 10 bases systems are so logical to us. 10 cm = 1 decimeter, 100 cm = 1 meter, 1000 meter = 1 kilometer.......now try that with inch, feet, miles.
But I still know that a 12" is a nice piece of vinyl for my pick-up, a 3.5" is a hard disk drive (or floppy) and that the singer of Vanity 6 needed 7" or more.....

(Which must have been the first conversion I did from inches to cm..........to see if I qualified
