Nexus 5 is really good phone as the lg has manufactured the parts of nexus 5. The parts will be very good there will be no parts problem. Its been 14 month purchasing nexus 5 there is no problem in it. It is still smooth and in working condition.
It gives very good speed. As it has 2.5 ghz snapdragon quadcore processor.and has 1.5 gb of ram . it has 2 phones that is 32 gb and 16 gb. The looks and the colors are very much good. I think you shluld go for it. Its the best workimg phone ever. There is no comparison between samsung and nexus. As it is stock android it hlgives more Fast update. Hope you find it helpful.
Thank you.