If in case you are not familiar with these, these are known to be two camera models that are available. The Canon Rebel T51 belongs to the Rebel line produced by Canon while the d5300 is one of the cameras produced by Nikon. They have some differences beginning with the megapixels of the two cameras. The Nikon camera comes with 24 MP while the Canon Rebel T51 comes with 17.9 megapixels.
Their sensor size is also different from each other. The Canon Rebel has a sensor size of 28.21 mm while the Nikon comes with a sensor size of 26.82 mm. Some people may choose one camera over the other through these key factors that are mentioned above. Others will also consider the screen size, movie format, focus, and so much more.