'Live mapping' LOL.

'Road mapping' LOL.

People who road map are those who haven't got a Dyno. If you have the choice, Dyno all the way. Adjustments can be made much closer and probably much safer, because changes can be measured, so it's possible on a Dyno to see if what you changed actually made any difference. You'd never know on the road whether the extra 3psi you're running had any real effect, so you might be running the extra boost for nothing, for example.