Quality before quantity, though both are preferable. A content minimum might just lead to more fluff to weed through and put more work on the GP team to come up with quality replacement sentences. That could in turn lead to poorer analyses, since the GP checkers aren't required to have a vast knowledge of each metagame they check, even if that would also be preferable.
One thing I've been wondering about is beginning sentences with numbers. I've always been taught to never do it, unless starting the sentence with a year. However, that grammar rule existed before EVs, I'm pretty sure. A sentence such as "252 Attack EVs ensures maximum damage output." looks acceptable enough, but I've been changing the wording to make sure the sentence does not start with a number. Can we either make an exception to this rule, since EVs are large enough and common enough in our analyses to be comparable to years, or make it clear that this is not acceptable? I've seen several checks stamped with these types of sentences, so if it's against our policy, we might need to edit some analyses on site...