Heirloom vs. Hybrid: A Fight We All Win

I wrote an article for Serious Eats recently about heirloom and hybrid tomatoes. Summer's nearing its end, but no matter how you slice it, any tomatoe is a culinary delight. But what are the differences between heirlooms and hybrids? Is one variety better than the other, and Are Heirloom Tomatoes Always Worth the Price?