The H series was the Hybrid - a combination of carbon fiber and glass fiber, intended to reduce the price point from all-CF. I'm not 100% sure, but the S or Studio series was Rainsong's first attempt at a uni-directional top, I believe. That is now the concert or C series. (If this is wrong, please correct this information - I'm working from memory here).
I have a WS-1000 with the 5" depth. It is not too deep, and I don't play dreadnoughts any more. The narrower waist makes it "sit" better. When a friend came over to A-B the OM on demo loan versus my WS, she preferred the deeper WS because it was bassier, and sent the OM back for a trade. The difference is similar to the Martin J-40 versus the M-36, if that helps in any way. The OM would be a better more balanced recording instrument through a microphone, but perhaps a little anemic for acoustic jams.
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