When i was doing research on TV's i was previously going to go for the LG sj850, they say the picture quality is really good, the only thing is that the blacks often turn light due to light bleed, its quite a common trend, not that bad in sunlight, but if you watch in the dark it will definitely be noticeable. Some people can deal with, some can't and unfortunately, the amount of lightbleed is just down to luck of the draw , im sure if the 850 has this, the 630 will have.
After all my research though the brands that i fell to were Sony and LG, they seemed to have the most consistent positive reviews across the board.
Sony's are very pricey though.
Samsung MU range is hit and miss, the 2016 KS7000 is a really really really good TV you could buy if you can find old stock but i highly doubt you will.