I'm fairly sure that i'm schizoid, (the criteria mostly match) but suspect that part of me is avoidant as well. The thing that makes me think, is whether or not avoidants can get pleasure from sex. That's if any avoidants have ever had sex, as a teen growing up, i had sex a couple of times but could not get any pleasure from being that close to another person, i just wondered if an avpds had ever had sex and enjoyed it.
I know this is a bit of a no-go area subject but it something that fascinates me about avoidants, you know what you want but fear/anxiety keeps you away from it, whereas schizoids know what they want (isolation) and they usually get it because its easy to push people away and live alone inside your own head.