Arena is definitely relevant, and Empire Wars tournaments are as well by virtue of how seriously players take them, prepare for them, and the level of competition.
DM is irrelevant, especially when you see Viper play three ladder games before the event and then clap everyone without breaking a sweat. The fact that he can do that makes him a more complete player than Hera or Liereyy but does not play a part in the question "who is the best player".
I don't think Arabia should matter much more than other maps. It's the most played and the best mastered map so it definitely means high competition for sure, but that also means top players don't really need to prepare for an Arabia tournament the way they would for Hidden Cup or the RBW.
DM is irrelevant, especially when you see Viper play three ladder games before the event and then clap everyone without breaking a sweat. The fact that he can do that makes him a more complete player than Hera or Liereyy but does not play a part in the question "who is the best player".
I don't think Arabia should matter much more than other maps. It's the most played and the best mastered map so it definitely means high competition for sure, but that also means top players don't really need to prepare for an Arabia tournament the way they would for Hidden Cup or the RBW.