this has happened to me, when the connection drops to 3G or faux 4G it'll connect me to really nearby towers but when I prefer LTE it connects me to an antenna that it is not particulary close, yet I get good signal around 3-4 bars of LTE.
LTE is still scarce, I'm guessing with time all towers will be upgraded
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it shows you info on the antenna its connected to and which other towers the iPhone can see (meaning you can swap sims and know which carrier has the better gear/coverage/antennas? )
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send him feedback over twitter @planetbeing
How would i know which carrier has the better coverage by switching sims? How would i switch sims? Like getting another service from another carrier?