
Metal!!!!!!
i had a plastic tray one when Gemma was younger.. the plastic tray didnt last that long as it split.
I Now have a metal tray one that my rabbit lives in. And it is far superior and will last a lot longer than my old one.
Also get the ones that are not coated. I have a smaller crate for when my rabbit needs to go to my parents, but it will look tatty very quickly as the coating is going to come of easily.
HTH
Lea :)