Advantage because it is a bye at the end of the season when you need it. Great for ND and Ohio state. Both teams beat the spread in their quarter final wins. Then getting a home game against a lower seed is a great way to get ready for the quarterfinal/bowl games. Notre Dame has by far the best setup of any team.
The benefit of the home game goes way beyond this playoff. Gives the home team a playoff win that counts as much as a nuetral game and huge economic benefit for the hosting team.