TXCXX or Deathmatch?

So revently I discovered Pro players basically never play standard Deathmatch, even for warmups. And for warmups they prefer TXCXX(1v1 Lijiang workshop)

So which one is better for improving Micro? I personally felt more pushed when playing TXCXX, than deathmatch. Ad deathmatch seems to have a lot of moments where third person kills me and enemy, and rarely get duels