I never try to draw on a computer (cause i spend most of my day on computer: more than 9 hours) so drawing had to be with a pencil or a pen or what ever it is .

The way you can do a curve, a line, an angle, an error.... i m not sur the computer will allow the same ( cause a computerlooks for the perfection, for another kind of quality draw, for another color...)

but may be i m wrong, who tried both ? and what is your opinion ?