I say 10 is quicker than 7 because I feel the flight from Lappa Mana Tunnel to Tree Mark is very long even with the Pegasus.
Although you have to fly from Pera Mana Tunnel to the volcano at Ep 10 at least it's done once instead of twice for Ep 7's Tree Mark.
Ep 7 is essentially good for saving money because you use no weaponry.
But I have more use for a Demonic Oculus Lance rather than a Illusion Control Bar so I'd rather stick with 10.
P.S. Don't let Cessair's Heart Reload. She will kick your ass if you do.