I like to go 27/1/2, put points into Revive, Smite, and Rally even if I don't use them. --- The CHA King I Rock : Garen, Anivia, Ashe, Ezreal, Fiddlesticks, WW, Annie, Jax, Taric, Kat, AP Yi, Trynd, Teemo, 'n Tristana.
If both work for you then it simply comes down to a matter of preference. Go down the offensive tree for some useless masteries just so you can get that increased 5% damage at the bottom of the tree? Or go down the utility tree and get *mostly* useful masteries (increased ms, mana regen, exp bonus) and get an equally useful 15% summoner spell reduction at the bottom of the tree?