Pedro is obviously better than him, but the fact that he is a CF who can play as wide forward on both sides means that we can rest Suarez while keeping Messi on the wing but still have the same player subbing for Messi/Neymar and not worry about having another player on the periphery wasting away as would be the case if we used a player who could only play CF and another player for the wings.
Edit: Also maybe I just have a La Masia hard-on but I rather give Pedro's mins to a young player with potential theres always the chance that Munir can blossom into a good squad player/ maybe even a starter(obviously not for a long time).