Deus Ex: Human Revolution Augmentations give you many options to pull the same task. It depends on what you prefer or rather what you are good at. If hacking your way to the objective is your thing, do that. If you are good extracting information from NPCs to make your way to the objective, do that.
Deus Ex: Human Revolution developers talk about these two aspects of the game in detail during this interview and highlight, how you can achieve your objective by talking to characters and searching for clues. Or hacking to get access to the restricted areas and turn off the security cameras to make your job easier. It’s a choice you would have to make given the circumstances.
So tell us, what would you prefer ?