Gazelle
G.O.A.T.
Well, I'm not a Murray fan, but look whom had Murray compete against in his time (prime Djofedal, Stan, Cilic, delPotro etc) and who is prime in Alcaraz's time. Can't compare achievements.
But Murray only made his first slam final at an age where Alcaraz already won four. It wasn't the Big 3 stopping Murray from making finals earlier.
So maybe Alcaraz is simply better.