Ed is looking for a 70" plus TV. What's the sweet spot for where to sit and which model should he buy? He can't find any mention of full-array local dimming. Scott says some do include the spec, some don't. But that doesn't mean that aren't FALD. The Samsung 70" Q70 is FALD, as is the Q80 and Q90. Scott also says the Sony X50 isn't, but the X950 is. Most LG TVs are edge-lit. 15 feet is ideal for and 80-85" TV. Check out this calculator - https://www.rtings.com/tv/reviews/by-size/size-to-distance-relationship. Scott says the Samsung Q70 or the Sony X900-X950!
What about a projector? A projector will never be as bright, so in an ambient light space, the LED TV is better.