Never tried Joes Quick Grape but Joes Ancient Orange really depends upon the age. If <12-18 Months it is almost always better chilled. If >12 - 18 months then room temp. I think when chilled it kind of masks the pith / orange rind flavor that comes through from the fruit when young that eventually ages out. (That.s my theory anyway.)
In my opinion pretty much any sweet Mead is better after aging for a bit at or near room temp.