Main
Model
Price
Advantages
launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Other resolutions
Sensor photo detectors
Image
ISO
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Boosted ISO (maximum)
Photography features
Minimum shutter speed
Maximum shutter speed
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
Flash range
External flash
Flash modes
Continuous drive
Self-timer
Metering modes
Exposure compensation
WB Bracketing
AE Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Viewfinder coverage
Viewfinder magnification
Videography features
Resolutions
File Format
Microphone
Speaker
Videography notes
Optics & Focus
Autofocus
Digital zoom
Manual focus
Number of focus points
Lens mount
Focal length multiplier
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Connectivity
USB
HDMI
Microphone port
Headphone port
Wireless
Wireless notes
Remote control
Other features
Orientation sensor
Timelapse recording
GPS
GPS notes
Samples
Videos
Summary
The D7200 has more focus points than the Nikon D3400: 51 vs 11. More number of focus points means less risk of losing focus lock while tracking a moving subject.
The D7200 screen is better as it has more screen dots 1,228,800 in comparison to 921,000 dots of the Nikon D3400 screen. The higher dot count screen is better for reviewing images on your camera.
The D7200 is environmentally sealed which means that it will be safe even uncovered if you are out shooting in the rain and snow. The Nikon D3400 battery life is better in compare to the D7200 battery life. According to CIPA standards the photographer will be able to make 1200 photos with the D3400 and only 1110 with the D7200. The D3400 weighs 395g which is 280g lighter than the weight of the D7200. The D7200 can utilize optional accessory GPS devices. Recording GPS data can be convenient if the camera owner is a traveller, to be able to check the image metadata and see exactly where a picture was shot.
The D7200 has 10 advantages and the Nikon D3400 only 2 so the D7200 will become the best choice. Check the list of the best offers on Amazon.