I was also in your shoes today, but Ive settled on an XZ, because...
- Camera is stunning since Laser AF, Light Spectrum sensor and 5-axis EIS/DIS.. Still no OIS though, but I dont find that an issue on the XZ, the 6P did great without OIS
- Camera now has Shutter Speed added to Manual mode, yet White Balance doesnt use a Kelvin Scale, you can
- Speakers on the XZ are improved, yet IMO still struggle to give a decent ringtone/Notiy volumes... XZ speaker are VERY good... but No where near the power of the 6P speakers
- Sony UI even more stock since 7.0 update, even includes Google Now as a screen
- Screen is excellent for a 1080p and REALLY vright
- Its a 2900MAH Battery, but Ive heard of people getting 1 - 2 days or moderate use
- XZ has SD Card slot
- 5.2" screen rather than 5.5" might feel like a toy if your coming from a 6P..
I considered the 3T as well, but it was the vastly improved camera and audio that swung me to the XZ..
If you can try both, but i like SONY devices
Feel free to ask anymquestions