I used a wire crate when I trained my oldest- I loved it and we never had any issues with it, he slept in it and went in it whenever I was out of the house until he was a year old. However, then I started hearing horror stories about the wire crates collapsing on dogs, or dogs getting their heads, paws, etc. stuck and injured. So when I got my younger one I only used an x pen set up and the rare occasion I needed a crate I used an old plastic type I had around. I think I am probably way too paranoid though, especially since I never had any problems with the wire crate. Either one is probably fine- I originally bought the wire crate because it seemed more open but I ended up covering three sides and the top all the time anyway, so that kind of defeated the purpose. Ha! that was probably no help, but just some things to consider- good luck with your little one
