looking for new 4k tv advice.

Hi our Sony Bravia 37" has seen better days so I went looking for a 48" HD TV but when I seen the 4K TVs the quality was unbelievable so I was hooked straight away I was looking for a Sony but I really liked the Samsung I can't go any bigger because of room, other than price and one being 3d is what is the difference between these two.

http://ift.tt/1Kg0zM3

http://ift.tt/1Kg0zM5

looking for new 4k tv advice.