I have both kinds of toe socks.  I have the ones with the heals and the tube socks like these.  I always buy multiple pair when I purchase.  They all go in the gym bag.  Unfortunately, when I pull the socks out that have heals, I always end up with two left feet or two right feet.  The socks without heals can be flipped over and used on the other foot.

There is a slight discoloration from the heal with wear time which looks a little funny when the sock is worn on the other foot.  Since this is down in the shoe.  That doesn't bother me.