> Now, the question is which one of these two I should buy. I am going to use
> it with both AmigaOS and NetBSD. I want quality, speed and compatibility. Is
> this possible at all?

 Both do same speed, have same quality. Ariadne offers two parallel ports
in addition. 

 Compatibility to what?

 Functionality is given for both, Connexion has A2065 compatibility mode.

-- 
Markus Illenseer