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The best refresh rate will be dictated by your hardware specs. Check the
manuals for the display adapter and for the monitor. Find the recommended
settings for both. If you do not have the manuals, you should be able to
find the information online. The recommended settings may match up or the
ranges will overlap. Pick settings within the range shared by both devices.
There will be recommended refresh rates for each resolution.
With CRT monitors, it's recommended to go with the highest refresh rate
possible to prevent eye fatigue.
Flat screen and LCD monitors usually have lower optimal setting as their
technology is different than that used by CRTs and the recommended setting
may be lower than the maximum refresh rate it is capable of for a
particular range.