Need help choosing

Im pretty much looking for a pair of over ear headphones that have better sound quality than my airpods pro 2 and jbl tune 720 bt im torn between the xm6 and the xm4 i can afford the 6s but idk if its worth the investment so the xm4 is also optional both pairs are extremely overpriced in my country with the xm6 being the equivalent of 550 usd