My advice, Don't buy either of them mate.
4 years ago ,We had a samsung 42 inch - only lasted 14 months - out of 12 month warranty - samsung customer services UK did not want to know - 14 months half of screen went black with picture on other half - samsung would not even consider paying parts or labour - i ended up driving the TV in the car 60 miles to nearest samsung stealer, took them 3 weeks to fix - £200+ for part & £200 labour = over £400. Same TV lasted another 8 months and the opposite half of the screen went black - DITCHED IT IN THE SKIP.
Should have known better as always had PANASONIC TV's before my ventures into flat screen. Always went fine.
Just over 3 years ago bought a Panasonic 50 inch after looking on TV forums (panasonic called "panny" on forums), bought from John Lewis as you get a 5 year parts and labour guarantee as standard (or you did 3 years ago) - anyway, TV brill, great colour and sound, fab HD and its got freeview and freesat built in - what more could you want. my view after the samsung episode, is that even if it lasts 5 years its doing good but hope for longer.
After the way i was treated by Samsung UK customer services I swear I will never ever buy any samsung product again. I know I sound bitter but i learned my lesson hopefully.
Blooooobirds !!!