If you go with the plasma, please make sure you're OK with a set that's very dim by modern standards - just over 100 cd/m2. About 1/3 of what OLED deliver. It's still well above what most PJ setups deliver and above the required levels for SDR, but depends on a dark room environment.
OLED image is better day and night (literally: bright enough for daytime, perfect blacks for the night), and for solo viewing, where you can sit wherever's best, there is no contest. Not even the extra size can make up for it (now a 110" PJ, we would be talking). If you can play with viewing distance to watch it as close as comfortable, any OLED wins.
The OLED you're considering is also presumably new and 4K HDR - otherwise, you should be able to pick a used 55" 1080p OLED for $600-ish.
If your 8-10 ft viewing distance is immutable, though, and you're OK with a dimmer picture and not getting into the HDR world, the plasma makes sense. You say you've got a PJ for proper movie viewing, so that settles the solo question. Now in your shoes I'd rather ask your family - would they rather have smaller top-notch picture or still very good but larger one.
At this size and distance you shouldn't be concerned about the poor processing in third-party displays, not to mention Netflix implies great video quality out of the box, no super-smart upscaling needed.
Last edited by AnalogHD; 05-26-2019 at 02:42 PM.