What tanning lotion should I use?

It matters how dark of a tan you want. With L'Oreal, it will give you the appearance like you just came back from the beach with baby-soft skin. With Olay, it moisturizes more than L'Oreal, and the tan will appear gradually as you use it everyday and it will give you a subtle tan. I wouldn't used Neutrogena though, because with gradual tanners you have to apply the lotion evenly.