To me, it merely depends on the context and who you are talking to.
In France, most anarchists and anti-autoritarians call eath other "comrades".
Some, especially individualists in and out of organisations, but also some autonomous and insurrectionnary anarchists prefere the word "companions" or "compa(s)", as a specific anarchist term.
I heard that italian anarchists, like some french ones often use the word "friends", or even "buddies" ("les copains" in french).
There is also a big joke here that says :
Do you know the difference between a friend and a comrade for anarchists ?
When a friend do some crazy shit with you : it's not a friend anymore.
When a comrade do some crazy shit with you... Hey ! At least... It's still a comrade ! ;-)