Other than the obvious differences (size, battery capacity, SoC, only a 16 GB version), the X has an AMOLED vs LCD, an SD card slot, an 8 MP secondary camera vs 5 MP, microUSB vs USB C, and as you say, one or three less LTE bands depending on whether you're talking about the EU / global or US versions. The US versions do not support LTE in NZ at all, while the EU / global versions of both support it on band 3 only. So very little difference between them worth worrying about, with the X arguably better unless the battery life is an issue – which it could be.
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i5 7400, Gigabyte GA-B250M-D3H, 16 GB DDR4, integrated graphics, Adata XPG SX8200 480 GB (NVMe), 3x Kingston SSDNow KC380 120 GB, Corsair MX100 128 GB, Spinpoint F3 1TB HDD, DVD writer, all inside a wood case I built, Dell U2412M 24", U2311H 23" IPS and Philips 150B4 15" monitors, wood-bodied mouse, Dvorak keyboard, openSUSE Tumbleweed, Windows 8.1 Pro in a VB VM inside Linux
I may occasionally give advice regarding (consumer) law, but it is only my opinion based on my reading – I am not a lawyer.
Romans 3:23; 6:23; 5:8; 10:9-10,13