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The Bell Star is designed more for a tucked/racing position as it is a race helmet and the RS-1 is designed to compromise between a tucked and less aggressive/more upright position so it's better for street while still fitting in for track duty. The RS-1 is a little lighter and also it's a bit more quiet. Both interiors are one of the plushest out there. I've really only run top of the line helmets from Arai (Quantum F and RX-7) and Shoei (RF-1000 and X-Eleven) and IMO Bell beats them both.
A couple factors. The new 20s isn't out yet and IMO doesn't offer enough improvement to justify the cost. I currently have a Scala Q2 Pro that I've used for 2 years and I'm not terribly impressed with Scala's performance and features. Everyone that I've seen that has switched from Scala to Sena has been very happy. I think Sena offers more for your money and has a greater quality over Scala.
Lastly I was able to work out a deal on the dual pack ($30-40 cheaper then anyone has them for) by doing a bulk purchase of them.