This is hard to define in quantifiable terms, but you don't want a country that's besties with the US, or too heavily dependent on them, because they'll be too willing to jump through hoops to avoid making them angry.

But you also don't want a country that is enemies or has strained relations with the US - they're very likely to take advantage of you/snowden for their own gain. Or arrest you and torture you for the information you have.

You want a country where they like the US, have normal diplomatic relations, but don't necessarily want to seem like a puppet of the americans. They should have a strong belief in protecting individual freedoms.

Also, when you try to get asylum/protection in a country like Brazil or Ecuador or Iceland, etc. - no one can stand up and say, "He's helping our enemies".