These are very different types of amps. What is the rest of your system? T owned the VT100 mk3 and never thought it was one of ARC's best. I currently own a Ref 110 which is a much better amp. I have also heard the Ref 150 and it is truly a great amp. I lust after the Ref 250's.
The Carver amps have more your classic tube amp sound. I prefer the more detailed ARC sound so it would not be on my list. I went there with Cary mono blocs some years ago and ended up selling them a few months later. You really would need to hear the Carver amps in your system to see how you like them.