I agree It does not really have any major advantage what you do before you do your licences.
I would suggest, Try and work in a customer role, A job where you are talking & using your brain at the same time - multitasking jobs.
A job where you are concentrating at your maximum, Using your memory to 'digest' information quickly.
Being involved in GA - General Aviation helps, But some Airlines now seem to be 'anti - GA'
At the end of the day nobody knows the answer really, To this question.
Best Of Luck.