Hanging by the leadouts is the easiest on the plane. While I do use a horizontal rack for transport and temporary garage storage, long term is via leadouts.
For a garage, one option is to hang them over the car hood, if applicable and available. That "hang 'em high" approach can be a space saver, if a little tougher to use, typically requiring a ladder. My basement closet cup hooks are set at a level that has the wingtips just a couple of inches off the ground, which is a safe, easy height for hanging.
Peter