Originally Posted by SpyCam

Well, I've seen that .XXX domains outrank .COM ones way faster.... Why? Because there are better chances for you to get a keyword rich domain in the .XXX domain than in .COM.

But yes, .COM is more trusted and higher authority TLD in the eyes of many site visitors and if two similar domains are standing one by one on a SERP, the .COM probably has more chances to have their click.