Almost everyone who watches Youtube has definately heard of PewDie. But a lesser known guy (goes under the name of Markiplier) does the exact same thing as PewDie. He plays horror games and occassionally other stuff. Personally I like Markiplier better because he has a better sense of humor then PewDie does and is a bit smarter when playing his games.
Channels-
Markiplier-http://www.youtube.c.../...
PewDiePie-http://www.youtube.com/user/...
Channels-
Markiplier-http://www.youtube.c.../...
PewDiePie-http://www.youtube.com/user/...
So neither