Yes, I've had both, and I do not prefer either, though they are different.
The camerock is a modded marshall tone, it has a great 80's vibe. Very versatile, but all the switches and knobs are a bit of a handful. So the Camerica looks fun too, same tone, less switches.
The Benzin is also a modded marshall, but has a smoother tone to it. It can get very heavy in a modern way. Although it's not totally what I've heard a VH4 is, it makes me understand why people love them. The 3rd Channel is clear and middy, the 4th channel is compressed and thick.
Both are a great choice. The Camerock takes a lot of tweaking than the Benzin, but both have beautiful tone.
I have a Camerock video up on youtube, and I'll see about doing a Benzin video this weekend.