AMD

Nobody answering the question, but yes keep it roughly around 1/2 refresh rate if you want 0 tearing. But keep in mind, that by keeping it unlocked and going above refresh rate, you're reducing the latency.

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For example:

110 fps cap --> 220 (with minimal visible tearing) = less latency

80 fps cap --> 160 (with 0 tearing) = bit more latency

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So it's up to what you value more really.

If I were you, I'd cap my fps around 90~100, because that FPS feels quite responsive already and the FPS overhead isn't big enough to cause too much visible tearing.