Which is best among Nikon D3100 and D3200?

I'm planning for my first DSLR.

Through i got some suggestions to go for D3100, though when checked i saw for some additional 4K i can get D3200 which have 24.2MP, whereas D3100 have only 14.2MP.

Can you please share your experience which is best among this?

additional to that can you please tell me which one is good in video? I need to shoot Full HD videos as well apart from images…

Nikon D3200 because it is the one after and yes it has good video quality. Including CMOS.

The Nikon D3200 has several advantages over the D3100. This tool lists them. Be sure to scroll down to the "differences" section.
http://snapsort.com/...ikon_D3100

And if you want to go for a little better camera, consider the Nikon D3300.
http://www.dpreview.com/...ikon-d3300

If you are just going to run the camera in Auto mode, The D3100 is plenty of camera.
If you are the kind of person that likes to have something a little better, consider the D3200 and D3300.
If you plan to take photography seriously and learn the exposure triangle and how to use it by taking control of the camera, consider stepping up to the D5100/D5200/D5300.

The D3200 is the better of the two.

The D3200 would be the best option, the D3100 is quite old now and getting replaced with many newer cameras. It also doesn't have manual controls in video, which would be quite bad if you plan on recording videos!

Here's a DSLR Buying Guide - http://www.smashingcamera.com/which-dslr-camera-to-buy/