Thank you for your answers.
It was more or less the one I was waiting for. I will try to convince my friend to give it a try.
I do not have a group of players who are really into "Roleplay" so I'm not used to. Let me know if there is another game that "reward" (Not the word I'm looking for but...) roleplaying.
I have to sell that to my friend : You can use Dungeons and dragons... Without rolling dice for walking, swimming in 10 cm of water or even breathing. (Roll for your breath. 1. You forgot to breath. You are dead.)
I think asking which version of D&D is best for that... 5E seems to be more light than 3.5 or even Pathfinder, which I'm not familiar with.
If you want to stick with D&D, and are relatively new to it, I'd recommend 5e, despite my miniscule experience with the system.
3.5/Pathfinder is great and offers a large amount of options, but newer players can get overwhelmed by all the classes and choices and customization options very quickly.
4e needs a lot of care in order to not drift to a very gamey playstyle. The combat system is great (in my opinion), but it takes a large amount of game time and book space.
5e offers a bit more laissez-faire rules and a generally lighter system. But the RAW options are not as broad as in previous editions.