I don’t own them but have worked on a few. Both are production pistols. Both have good features and both have short comings. It just depends on the features you like.

 

Your are looking at two different animals with similar features.
But the DVC was a steel frame vs aluminum. The more popular tree bark grip. More slide machining and came standard with the rose gold TiN barrel. And I may be mistaken, but I don’t thing the bottom end of the DVC-C allowed for a magwell.
Some would argue that when the DVC pistols were building built, was at STI’s pinnacle of production.

Between the 2, if I was carrying everyday for hours in end, C2. The weight savings will be more noticeable than anything else. The DVC-C if it was going to be shot more than carried.

Keep in mind that I am in the process of switching from an all steel STI Guardian to a lighter weight C. The Guardian definitely is softer shooting, but both are accurate. But as soon as I held it, I could feel the 8oz difference.

 

I've had multiple iterations of both. Differences offered in the DVC-C or DVC Carry are night sights, short trigger, ES grip, slide cuts, TiN bbl coating and no mag well. Also, I don't believe the DVC-C was offered in an optic-ready version until maybe at the very end of their run, when STI was using the HOST mounting system. And I thought my Carry models were alloy frames- I don't remember them being significantly heavier than my C2.

Regardless, it's going to come down to your preferences and your bank account. At the end of the day, for me, a brand new Staccato C2 DPO w/ Trijicon RM01- which displays absolutely surgical accuracy in my hands- can be had for less $$ than a used DVC-C in which I'd have to invest additional $$ to give me a comparable setup to my C2.