It's my understanding that the surface of quartz can be given more micro-smoothness than pyrex. I haven't heard that this is a real issue in any practical sense.

Someone with broader knowledge than me will have to chime in about whether there's a real quality difference. To answer the original question, I'd advise to get the highest quality secondary you can afford. Fortunately, they aren't hard to find. The brands mentioned above have excellent reputations.