Which Is The Best DSLR Camera Nikon D3300 or D3200 or D5200 ?

Define "best".

A lesser camera in the hands of an experienced shooter will yield better results than the best camera money can buy in the hands of someone with no experience.

With Nikon Dxxxx models, as the four-digit number following the "D" increases, the body get better and better. With their Dx models, as the single digit increases the body gets better.

Keep in mind though, if you put a good lens onto the cheapest Nikon, it will produce better image quality than than poor lens on their best body. Image quality comes from the lens and the user, not the body. The body is just a box that holds the sensor and provides you with the controls/performance needed to get the shot.

Here's a good tool to compare bodies: http://www.dpreview.com/products/compare/side-by-side?products=nikon_d3200&products=nikon_d3300&products=nikon_d5200&products=pentax_k50&products=pentax_k3

I'd take the Pentax K-50 over any of them;

In-body image stabilisation (works with ANY lens).

Pentaprism viewfinder with 100% coverage.

Two control wheels.

The ability to meter with legacy lenses.

Weather-sealing.

Body motor (any Pentax AF lens allows autofocus with ANY Pentax DSLR body).

The same Sony sensor.

The K-50 gives the performance of the D7200 at the price of the D3300 or D5300, but if you want to buy an inferior camera because you've never heard of the oldest SLR manufacturer in Japan.....

Nikon D5200

Nikon is D5200

Nikon D5200 is the best one

Nikon D5200 is the best among all due to having latest features and fixed bugs.

The best dSLR camera is not one those three but among them, the D5200 is the best one.

In terms of specs and features, the latest and more expensive model -- the D5200, although the D3300 is newer. The newer comparable D5xxx-series cameras are the D5300 or D5500, which would have better specs and features than the D3300.

The best camera of Nikon is D5200.