On the surface, Mane is less erratic, two footed, works harder defensively, is really important for us as a ball carrier in transitions, is less greedy and has loads of bottle when the chips are down.
Still gonna say Salah though. His flaws sticks out more, but he also goes through more good work in a game than Mane does, both in front of goal and creating chances for others. His attacking intensity is probably the highest of anyone in the world and more than makes up for his sometimes erratic displays and sometimes greedy decision making.
He's always at it and it shows in his output in both goals and assists. Doesn't get nearly enough credit for how many games he carries us through.