The more expensive one on wheels is better, but the second one is out of the question, I consider it cruel to house a G Pig in that cage, maybe suitable for a rat, but that is about all, I still think you should get someone to make you one, like a rabbit hutch, with adequate housing and a long run for them to run about in, in NZ they are always housed this way, so they can eat the grass on the lawn, however we donot get snow where I live, so that has to be addressed.

Personally I consider anything less to be cruel, they need to beable to run around , not sit in corners and move from one to another, please consider this and plan it all before going ahead and getting them.