Scrum Master vs Project Manager The Problem HD

Scrum Master vs Project Manager. Who is better? Theoretical agile and plan-driven worlds cannot co-exist in one project. Mindsets, roles, processes and artefacts are that different. And yet in real life you will often see an agile project manager leading a scrum team. So, Scrum Master vs Project Manager. Is it really a confrontation or just a confusion around implementation of different frameworks?