I did not own a plasma set, but did switch from 10-year-old LCD to Sony OLED. Have owned OLED for about 7 months. I went with the Sony because I always had very good experience with the brand and 3 out of 4 of the e-geeks at the local Best Buys suggested that they liked the Sony better, saying it had a superior processor and their colors were more natural looking than LG, which tended to look a tiny bit brighter and more saturated. The 4th geek owned an LG OLED and he thought it was close enough to the Sony, that the lower price made it a better choice.

I still marvel at the picture almost every time I watch it, especially for sports. Only 2 minor downsides I can think of: 1) I swear I can now see blemishes in on-screen faces and can even spot makeup that attempted to cover them up, and 2) the built in audio (without soundbar or other) on the Sony is nothing great. I did not really check out the LG audio.