My daughter's chin is a big boy..he has a wheel but it's a 15" wire mesh wheel that he mostly just sits in..because he's kinda chunky so it sags when he's on it since it only has a center connection screw to mount to the cage. He doesn't get a lot of treats and junk...mostly just pellets and hay and she rations that so he doesn't get too much..he's just a big boy. LOL! Looking to get him a better wheel so he will get more exercise...my question is..which is better for heavier chins? The metal saucer or a chinspin?