My reasons:
- LTE
- Large display
- I can use my micro SIM card
- Memory is Possible
- Enduring battery
- No Android
- Good price / performance ratio
- All important for me apps available (do not need the 51. Flashlight App)
- Sensible software like Office as standard
Since I had the same also ordered a 32GB micro SD card, was and still is the little phone memory not a problem for me. Have after the update to Windows Phone 8.1 still 4 GB free. Everything else is stored directly in the SD card (-> Settings -> Storage Optimization).