What is the difference between `queryValue()` and `SysQuery::value()`?

For normal day-to-day range values, both are commonly used to format a value correctly for a query range.

range.value(queryValue('US-001'));

and:

range.value(SysQuery::value('US-001'));

solve the same basic problem.

I normally use whichever style is already consistent in the codebase I am working in. There is no benefit in mixing both styles in the same class just for the sake of it.