As someone who does a fair amount of international travel, looking at the iPhone 5s’ LTE support of the different models is pretty interesting. The thing that popped out as possibly the biggest choice is the A1533 (T-Mobile unlocked version) vs the A1453 (Sprint). The A1533 supports Band 1-8, and 13, 17, 19, 20, and 25. The 1453 supports all of those and adds 18 and 26.

Based on the fact that you simply get MOAR bands and that its an option that’s available for me I initially was tending towards picking the 1453, however, looking at Wikipedia’s list of LTE networks, it turns out those additional bands are not so useful. 26 is only used by Sprint and KT in South Korea (KT also supports band 3 and 8), and 18 by au/KDDI in Japan.

Basically, not very compelling additions, so may not be worth the trouble. By comparison, the Nexus 5 will support band 2, 4, 5, 17, 25, 26, 41.