After reading all the discussions, other forums, pinterest, etc. I have concluded the following:

How much leg to show is a personal thing. Depending on the outfit anything from just a smidgen to a few inches is Ok if you think it suits you.
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It is all a matter of how the different style of the booties work together with the outfit.. Example. Moto boots, and lace boots look good with leggings or skinniest tucked into bulky socks. Crops with various amounts of leg showing with dressier booties with at least a bit of heel.

Comparability of pant leg width, boot shaft height, width of booties, is all that maters. Most can work with the right combinations, but this is the hard part..

This is all a matter of personal style. If it feels good, looks good to you, then it will be FAB.