Bottom line: Which one is better?
MOTO Z3 is a better phone than MOTO X4 64 GB because it has a better operating system Android v8.1 (Oreo), compared to that of MOTO X4 64 GB Android v7.1 (Nougat).
In review of MOTO X4 64 GB vs. MOTO Z3, we note the following features in terms of display;
Resolution; MOTO X4 64 GB has full HD (1080 x 1920 pixels) while MOTO Z3 has 1400 x 2880 pixels.
Pixel density; MOTO X4 64 GB has 424ppi while MOTO Z3 has 402ppi.
Screen size; MOTO X4 64 GB is 5.2” (13.21cm) while MOTO Z3 is 6” (15.24cm).
Screen protection; both phones have Corning Gorilla Glass v3
Display type; MOTO X4 64 GB has IPS LCD whereas MOTO Z3 has super AMOLED.
Touch screen; both phones are capacitive touchscreen multi-touch.
In terms of performance review of MOTO X4 64 GB vs. MOTO Z3, the following features are evident;
Chipset; MOTO X4 64 GB has Qualcomm snapdragon 630 while MOTO Z3 has Qualcomm snapdragon 835 MSM8998.
Graphics; MOTO X4 64 GB has Adreno 508 while MOTO Z3 has Adreno 540
Processor; MOTO X4 64 GB has Octa core, 2.2 GHz, cortex A53 whereas MOTO Z3 has Octa core(2.45 GHz, Quad core, Kryo 280 + 1.9 GHz, Quad core, Kryo 280)
Architecture; both have 64 bit
RAM; both have 4GB
Settings; both phones have exposure compensation, ISO control
Camera features; MOTO X4 64 GB has digital zoom, auto flash, face detection, touch to focus while MOTO Z3 has wide angle selfie
Image resolution; both phones have 4000×3000 pixels
Sensor; MOTO X4 64 GB has CMOS image sensor while MOTO Z3 does not.
Shooting modes; both phones have continuous shooting, high dynamic range mode (HDR)
Resolution; MOTO X4 64 GB has 16MP Front Camera while MOTO Z3 has 8MP Front Camera.
Physical aperture; both phones have F2.0
Optical image resolution; available only in MOTO Z3
Video recording; MOTO X4 64 GB records at a speed of 3840×2160 @ 30 fps, 1920×1080 @ 60fps, 1280×720 @ 30 fps while MOTO Z3 can record speeds of 1920×1080 @ 30 fps.
Loudspeaker; both phones loudspeakers
FM Radio; only available in MOTO X4 64 GB
Audio jack; MOTO X4 64 GB has a 3.5mm audio jack while MOTO Z3 uses USB Type-C
In terms of battery features of MOTO X4 64 GB vs. MOTO Z3, we have the following reviews;
Battery power; both phones have 3000mAh
Both phones have a quick charging system
Type; both phones have Li-ion battery
Fingerprint sensor; It is located in front for Moto X4 64GB and on the side for Moto Z3
Both phones have light sensor, proximity sensor, accelerometer, compass and gyroscope
MOTO Z3 is slightly technological advanced compared to MOTO X4 64 GB.$ 279.99