In a way you are comparing apples to oranges. The Volt, for example, is designed for those with a short commute and short daily usage. After you burn through the electric only range you are running on premium gas (to run a generator).
The Prius (regular version) is an all around commuter car. Rock solid Toyota reliability-I drive one 30k plus miles a year (60/40 highway), the only repair I've ever had to do was replace the ICE's water pump. The Prius is a light, relatively large car and will get blown around some. Not so much that an observant driver can't easily handle, but a condition you have to stay on top on windy days.
The C-Max is substantially larger than the regular Prius, more comparable to the Prius-V. Lower mileage than the regular Prius but fine. Ford managed to shoot themselves in foot repeatedly in rolling out the car by (a) lying about its mileage and (b) saddling it with what I and many see as an over complicated, buggy infotainment system. Finally, when I was researching buying one I ran across several complaints on the net that the C-Max over-reported its gas mileage, that pencil and paper calculations consistently resulted in several MPG less.
I was impressed with space of the C-Max though. If you find one comparably priced to a regular Prius (same year, mileage, etc) I'd probably go for that. But since I tend to drive cars into the ground I generally could car less about resale value.