Peat is worse. That's not to say lignite is in any way "good", it's still a horribly inefficient way of getting energy. But peat stores large amounts of methan

Peat is worse. That's not to say lignite is in any way "good", it's still a horribly inefficient way of getting energy. But peat stores large amounts of methane and carbon which gets released when drying it. Mining lignite coal also release some of that, but in much smaller amounts.