Is it better to adopt from the pound or a rescue?

On the one hand, adopting from the pound saves a dog that might get euthenized, while on the hand, adopting from a rescue opens up another spot for them to save a dog that could be euthenized. Are there other factors and repercussions I'm not considering? I feel pets adopted from a rescue are more likely to be healthy -- they've been vetted and fixed -- but they're also more expensive (sometimes hundreds and hundreds more), so I think that cancels out.