second pair Nikon first and Canon second.
No interest in the camera, but you're not comparing like for like:
Pic #2:
Camera Maker: NIKON
Camera Model: COOLPIX P900
Image Date: 2015-05-16 10:33:54 (no TZ)
Focal Length: 357.0mm (35mm equivalent: 2000mm)
Aperture: ƒ/6.5
Exposure Time: 0.0020 s (1/500)
ISO equiv: 280
Exposure Bias: none
Metering Mode: Center Weight
Exposure: program (Auto)
White Balance: Auto
Flash Fired: No (enforced)
Orientation: Normal
Color Space: sRGB
GPS Coordinate: undefined, undefined
Software: COOLPIX P900 V1.1
Pic #4:
Camera Maker: Canon
Camera Model: Canon PowerShot SX50 HS
Image Date: 2015-05-16 09:30:53 (no TZ)
Focal Length: 215.0mm
Digital Zoom: 1.953x
Aperture: ƒ/6.5
Exposure Time: 0.0063 s (1/160)
ISO equiv: 100
Exposure Bias: none
Metering Mode: Center Weight
White Balance: Auto
Flash Fired: No (enforced)
Orientation: Normal
Color Space: sRGB
GPS Coordinate: undefined, undefined
The Nikon looks like it's applying more noise reduction to the jpeg, but it's at ISO 280. The Canon is at base ISO, so much less noise reduction needed. So the Canon jpeg looks sharper.
You need to compare the two cameras at the same settings to see which is better. It might be that the Nikon will always be heavy handed with noise reduction, so always look softer. But based on the images you've posted; I'd keep the Canon
(I should add; I've never owned/used a Canon or Nikon camera, so I've no vested interest

)