Samsung is a great company. I bought samsung led a year ago and still it is working really good. I have samsung led series 5 and it is super hd. It has no late starting issue and any other of issue .I have both sony and samsung led and if we compare both of them I will choose for sony as it is better. The resolution is better of sony as compared to samsung. Talking about its after sale service, they are really good and that is because of its brand name. Talking about its sound quality, ill again say it is good but sony is better .
At last I would say you can go for samsung as it is having a nice led with no major issues and if we compare its price with that of sony , it is relatively cheap .