Do not force vsync using GPU control panel. It can cause problems, for example slowdowns if your monitor max is less than what WinUAE wants.
You usually want 50Hz when running non-WB stuff (no need to manually change anything, refresh rates are available in WinUAE GUI). Note that usually 50Hz is only available via HDMI (and not via DP) unless monitor is variable sync monitor.
But best option is variable sync monitor (+GPU that supports it). Then you don't really need to care about refresh rates, it simply works automatically.
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