He knew that even if they had a choice, Grantaire would not doubt take being stuck on the ship to fighting the barricade. And of course that was how it could be worse. Not that Grantaire did much fighting. He would be able to drink his wine as easily on the ship as he would on the barricade.
But Enjolras was tired of the same argument. They both believed in different things and nothing would change that, it seemed. But Grantaire was his friend and they were stuck on this ship together, for now.