I would suggest you use a program like CapFrameX to make the performance measurements rather than the options you listed in your post. Here’s why.
We all want smooth framerates to prevent stutters. All of the tools you mentioned show the average framerate and in my experience the average framerate is not the determining measurement of smooth frames. As you know, this game does not require high framerates. You don’t need 60 fps. You can get smooth framerates averaging 30 fps in this sim.
CapFrameX can measure the “time difference between 2 consecutiive frametime values” which means it compares the difference between the frametime of 1 frame versus the frametime of the next frame. Here’s an example. In this example I changed the in-game render scaling between 80%, 90% and 100%. In the chart blue is good/smooth framerates and red is bad. Look how it changes as I change the render scaling.
I also use this measurement as I change the in-game settings. It’s sensitive enough to really show what happens as you adjust your settings.
I next capped my framerates to 36 fps and look how the chart changed. By capping my framerate I’m able to run smoothly at 90% render scaling.
Good luck.