I like both Rupp and Fox mini bikes. I have several of each. They are different, but similar in a lot of ways. Rupp moved away from minibikes (or mini cycles) and moved to more motorcycle styles, before they exited the market in 1975. The RMT and other models are not for me. Fox seemed to stay with Tecumseh motor bikes longer (which i like.) I love the Fox 198mc model. And the Thunderbolts are really nice too. I really like all the spoke wheel/tecumseh motor fox models. I'm not a fan of their 1960s stuff though.