If you are only after the currently best MSFS performance 11900kf. If you want a little bit less performance but want to have 4 more cores and better thermals, go with 5900x. If you want to spend less money on the cpu which you could reinvest in faster ram etc., the decision would be similar for your other two listed cpus. Note. 5900 is a OEM version, where 5800x would be the next lower retail model, with only 8 cores. Best memory is either low latency 3200 sticks or 3666/3800 cl16 sticks. If you spend more money there is even faster ram, but I would not go there.
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