The Mugen and the xray are almost the same car except for the pillow ball front end versus the c hub. That said, the Xray spare parts are more expensive and usually harder to get.
None of those 3 cars will treat you wrong but the Hyper 8 is still a bit of an unknown quantity.
"I have no idea what you're talking about, so here's a bunny with a pancake on it's head."
In mind and body, we're all heading towards old age. It is slower to go by bike.