Does copper have a higher resistance to electron flow than aluminum?

No, copper has a lower resistance to electron flow than aluminum for a given cross sectional area.  So if two cables have the same diameter, the copper one will conduct electricity better than aluminum.  However, an aluminum cable of the same weight as copper will conduct electricity better than copper.  It is for this reason that aluminum is often used for overhead transmission lines, resulting in a lower weight than similar performing copper cable.