I've bought both for our baby. It will stay in the basinette for as long as it's comfy then move onto it's cot.

I have to agree that I personally think cots are just waaaaaaay to big for such tiny little bundles. In saying that I have seen those like cushion things that have raised/padded sides which you put them in and straight into the cot for a bit of extra 'protection' around them.