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
Boosted ISO (maximum)
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Boosted ISO (minimum)
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
AE Bracketing
WB 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
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
Storage included
Connectivity
USB
HDMI
Wireless
Remote control
Other features
Orientation sensor
Timelapse recording
GPS
GPS notes
Samples
Videos
Summary
The Nikon D300 has more focus points in compare with the D90: 51 vs 11. More number of focus points means more convenience while attempting to focus on objects that are not centred.
The Nikon D300 screen is better as it offers more screen dots 922,000 in compare to 920,000 dots of the D90 display. The higher dot count screen is better for reviewing pictures on your camera.
The Nikon D300 is weather sealed i.e. the camera will be safe even uncovered if you are out capturing photos in the rain and snow. The Nikon D300 battery life is better in compare to the D90 battery life. According to CIPA standards the photographer will be able to capture 1000 shots with the D300 and only 850 with the D90. The Nikon D90 weighs 703g which is 222g lighter than the weight of the D300.
The Nikon D300 has 6 advantages and the D90 only 4 so the D300 will be the best choice. Check the list of the best offers on Amazon.