Why is LTE slow in some areas and super fast in others?

I recently (about one week ago), purchased a 16GB iPhone 5s after never recovering my stolen iPhone 4. I have AT&T, and I've noticed LTE can either be ultra fast, or complete opposite. That's strange to me since I thought LTE was the fastest, followed by 4G, 3G, and E. Sometimes the LTE is very fast, and in other areas, even with LTE, it is slow. I'm just wondering why that is, and is it only with AT&T this happens? I live in Saint Louis, Missouri. And with STL being a pretty big metropolitan city, I would assume it would be fast.

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