not a Lakers fan, but born and raised in Hollywood, so Lakers in 5. unlike Boston, we know for sure the Lakers can win on the road!
The Celtics can win on the road, they took two in Detroit in the Eastern Conference Finals.
Not to mention they have the best road record in the NBA during the regular season and have defeated almost every Western Conference power house (they lost to the Suns) on their own floor. They took both games against the Lakers this year at home and on the road. Sure the Lakers hadn't conned the Grizzlies to get Gasol yet when they played earlier this season, but even then, the Lakers could do nothing to contain Allen, Garnett, or Pierce. All three had very good games. Gasol will do nothing more than help contain Garnett a little which isn't a big deal, Allen or Pierce will step it up. Both teams have a lot of talent, but Boston has the edge.
The only thing the Lakers have going for them that the Celtics lack is experience in the Finals. I don't think that will be enough for the Lakers though, I think it will be the Celtics in 6.