We already know though.
Pony genetics: How do they work?
Ships for the ship god, pairings for the pairing throne!Biggest ship is best ship, right?
Also interesting result I got playing around:
Soarin X Cadance
Sapphire Shores X Soarin
Soarin X Fluttershy
That's all in a row mind you. Apparently Soarin gets alllll the fillies.