If it’s ONLY for flight sim and you 100% are not going to consider ultrawide or multi monitor setup at any stage, get whichever is cheaper.
Difference between 39" and 43" isn’t going to be earth shattering in terms of size.
For flight sim specifically, you probably don’t need (or might not actually be able) to reach above 60fps.
I recently switched from a large 55" OLED TV to 3 x 4K monitors…only because I was having so many issues getting head/eye tracking stuff to work reliably, and I like having a nice wide view out of the cockpit so I can see all the wonderful scenery and spot upcoming airports etc.
With the TV, even at 4K, I definitely felt like there were times I wanted to “look around” more…because the 16:9 ratio just wasn’t enough for me…
When the tobii eye tracker was working, this was fine…exept tobii eye tracker software seemed to cause no end of issues OUTSIDE of flight sim…I’d be playing other games and get tabbed back to the windows desktop randomly…took me a long time to narrow down the culprit…it was definitely the tobii software…even though focus logging software would just show it as “explorer.exe” that was “stealing focus”…because when I uninstall all traces of tobii, the problem goes away…install it again and it comes right back.
I’m much happier with the new triple 4k setup for flight sim, and actually play most games on this triple setup now. For flight sim I have it setup as 3 separate displays and use the experimental settings in the sim to set up the 3 views. For all other games I use nvidia surround…and even though there’s some stretching/distortion at the sides…it allows me to have a much narrower FOV (so it’s more zoomed in for fps games for example) but without actually losing any peripheral view, because that’s displayed on the 2 side monitors…over all, I find it just a really cool way to play games.
They are 144hz max monitors, but I actually have them set at 90Hz…most games can hit 90fps with my system, but above that is a struggle anyway…and it also means I can set flight sim in game vsync to 33% and it gives me a pretty solid 30fps throughout…which sounds low…but for flight sim it’s actually more than enough and feels very solid and smooth.
But yeah…basically…if you’re not using eye tracking, and 100% are not ever going to expand your setup with other monitors…there’s no harm in getting the TV if it’s better value…as even 30fps is totally fine for flight sim…and it’s not the type of game where you really need the lowest possible input latency either. As long as you’re happy with 16:9, TV is totlaly fine.