I'd drive both. Generally, the cmax is a much better handling and driving vehicle, but build quality is more variable; I own two cmaxes and despise Ford's poor quality-build on both although I way prefer the way those drive compared to the prius when we tested both. We haven't had anything catastrophic go wrong with either (yet). Whichever one you prefer, have a trusted mechanic give it a thorough inspection for peace of mind. 2016 and newer cmaxes are the better builds.
Greg