They're pretty far apart in design concept really. I've never ridden a roubaix, but I would imagine the ride quality is drasitcally different. Some say the venge is rough, a race only bike, but that's subjective. I have no problem with 6+ hours or 100mile rides on my venge.
If geomety is you main concern, then compare their listed tables. My tarmac is slighly different than my venge, and I would imagine the roubaix would be a step beyond the tarmac. The problem I have is getting the tarmac setup as agressivly as the venge, and the damn slamthatstem top cap is on backorder. That said, the head tube on the venge is taller than the giant tcr I had before, so while the drop is still agressive, I feel down right fred on the tarmac.
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