Virgo + Capricorn
Taurus + Libra
Pisces + Scorpio
Well obvious element getting along for 1st and 3rd, more things in common, people with similar natures, more likely to get along well.
Taurus and Libra cause I'v seen it lasting often, both Venusians, have refined taste for beauty, might be difficult for Libra to put up with Tauruses but because they want to balance everything they don't accept it as failure so easy