3g generally deals better with range from the mast, LTE quality drops extremely quickly when you're in a medium to low quality area. The 'larger packet' idea doesn't really come into play, it's more that the packets are being seen as corrupt or invalid and re-retransmitted. This can easily eat bandwidth allocations and will also give you your dropped frames and such in a video (set larger buffers if possible).
Over all, for a Kindle, who really cares? The 3g will be more reliable and far more broadly accessible.
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