|Looks like red/white/blue/green pixels on LG OLED|
So I am going to try and cover some of the things that may help in the choice, and explain some of the experiences I have had with TVs recently.
I have used many TVs, from different manufacturers, and the latest is testing a 55" LG OLED HD TV.
The price is perhaps the key thing for almost everyone - and typically you'll buy a TV that is just slightly more than you budgeted for as there will always be some feature that is available if you stretch that little bit on budget.
One of the key factors in price is the size of the TV, and this is likely to always be the case. The other key factor is the use of latest features in the technology, but size is a massive factor. To be fair, size is often a matter of what will fit the room - a small room does not need a 65" TV, and even a large room can work perfectly well with a 55" TV. You need to consider what you can afford and how it will look. It is possible for a TV to be too big if in a small room.
A curved TV is one of the latest things. It is possible with some of the newer technologies, and is an odd thing if you ask me. I could not really see the point of it, to be honest. A curved TV will almost always not be wall mountable (I know one person that has). However, the key thing I have noticed when trying one is the reflection. In my front room my seat (my "spot") gets reflection of the windows at the back of the room, and that is annoying. However, a curved TV reflects a smaller part of the room, and just by sitting slightly to the left or right I can completely eliminate the reflection of the windows. This, for me, is one of the only reasons to consider a curved TV - otherwise you hardly notice the slight curve.
The latest tech for TVs is OLED (organic LED) which is where each pixel is individual LEDs (Light Emitting Diodes) which emit light. This products an amazing picture, and the black is black and the contrast is infinite. It looks stunning, I have to say. The only issue is lifetime which I cannot easily tell on a new TV. I am impressed with OLED (on an LG).
The slightly older technology is LCD (Liquid Crystal Display). This is damn good, but confusingly we see TVs sold as "LED", which just means "LCD" with an LED backlight. The way LCD works is you have a backlight behind the screen, and the LCD blocks some of that light. Compared to OLED this uses more power, and the black always lets some light through so the contrast is not as good. The best LED backlit LCD TVs use selective lighting behind the LCD, so that you get black when the screen (or large parts of it) are black as they turn off the back light in those areas. LCD is cheaper than OLED but not quite as good. Even so, these days, LCD is damn good. An LED backlit LCD is usually lower power and thinner than an older LCD, but not always as good in terms of quality.
3D is a nice feature, and some 3D films work really well. There are two ways to do this - one uses a fast screen changing left/right image and shuttered glasses. These are, in my opinion, bad. They need batteries that are always flat when you want to use them, and are expensive. They flicker which is annoying if you can see it. They bleed through as very difficult to make them work perfectly (each eye sees a "shadow" of the other eye's image slightly offset as a ghost image). They only work when your head is dead level. By contrast, the other method as used in cinemas is polarised glasses (circularly polarised) with an LG TV (they are the ones with the patent). Only downside is you lose every other line of the image as each line is left or right eye and fixed (see below re 4k TVs). However, the image works at off angles, has no flicker, and really works well. The glasses are cheap, light, and even have "clip ons" for normal glasses that also work in the cinema. This, for me, means an LG TV as they are the only ones with such a system of good passive 3D.
Most TVs these days are HD, so 1920x1080, but the latest standard is 4k (usually 3840x2160). 4k is expensive as a latest tech, and is not typically broadcast though netflix have some 4k content and no doubt it will be the next big thing. One nice thing if you have a 4k 3D LG is you can watch HD 3D without losing lines, as every other 4k line is left/right so at HD nothing is lost (in theory, I have yet to test). I have seen 4k though, and it is impressive - I can see the difference with SD/HD but 4k is just that bit better and impressive.
I don't really expect to use the "Smart" features of a TV as I will use with an AppleTv, Sky box, PC, and so on. But they are pretty good these days. The latest LG has netflix and talks to flex, and so on, so not too bad. They even have half decent web browsers these days. Beware that they log all you do back to the manufacturer (often unencrypted) so you may want to firewall them. I'd be happy if they did a TV with just many HDMI and not "smart" at all.
I am no expert on sound and would connect to some external thing via optical - sorry I am not a lot of help on that.
Well, for the garage, it will have to be LG (for the passive 3D), OLED (just looks so good), 4k (well, you have to), and probably 55" or 65" (big room). Sadly that will have to be curved I expect. It will not be cheap.