A.H.
My little on has had a toddler bed since she was one and a half. (She's 4 now.) Once her climbing started scaring me that she'd fall from the height of her crib. She is a monkey.
We went with a toddler bed because it is much closer to the ground. She loves her bed. Her bed is wooden and cost us $50 brand new.
In a couple of years we'll switch her to a twin or full size bed. I like that idea that she'll have the bigger bed as another milestone to celebrate.