I waffled for a bit, but I went with Cueto. My reasoning was the age factor. One of Cueto's comps at age 23 is, oddly enough, Zack Greinke. One of Greinke's comps at age 25 is Jose Rijo.
So my logic says that if I can have 2 years of Cueto (with Greinke numbers) before he turns into Rijo...then I take it. That was my logic, flawed or not.
Of course, I didn't try predicting who Greinke turns into in 2 years.