When mountain hiking, rubbing should be limited as much as possible to prevent blisters. Check that your socks feature specific fibres on the heel and tips to limit rubbing. Some socks feature a "double skin" concept to limit rubbing.
Greater comfort is required when walking across lowland. Some socks adapt to your body type with pairs which differentiate between the left and right feet to better adapt to your shoe size. Favour socks with minimal seams.