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45'' feels great coming from 38''. I wouldn't mind bigger. However, with the two monitors you are looking at, the 45'' looks like it will take a lot of desk space due to the design of its stand. The modern LGs have a much better stand design, making 45'' monitors perfectly feasible even with little desk space. So I would look for a 45'' LG or one with a more compact stand. Otherwise, the 39'' will be good too. Also, people don't talk about this much, but the worse your eyesight is, the more you will benefit from a larger monitor. So consider your eyesight when deciding on a monitor size. 45'' for someone with myopia is very different from 45'' for someone with perfect vision.

These monitors will make all look like you are racing through letter box. If you can get your monitor close to your wheel and whant to use singular monitor get Acer Predator X45bmiiphuzx (850eur at megekko now ;) )You will have more vertical fov making you not feel like you ride cabrio ;) and if you can get it 60cm from your eyes pretty decent hFOV thanks to 800r curve I have AOC 45inch 800r Oled monitor, and love it

Ultrawide and FFXIV is amazing, works really well. I use a 3440x1440 AOC monitor at home. Only downside is the cutscenes. I would suggest that you move the monitor futher back on your table. At the moment it looks like it is to close to you.