I agree with skibum on all accounts. Another thing to consider is new technology from both manufacturer’s to reduce chain slap. I am currently on a SRAM XX drivetrain (which doesn’t have Type 2 even on the 2013 model) but my next upgrade will definitely have one of these technologies. I’ve only heard good things about them – lots of head to head reviews out there.
[url:34g76i5a]http://www.sram.com/sram/mountain/family/type-2[/url:34g76i5a]
I can’t find Shimano’s official page for Shadow Plus but there’s no shortage of info on other sites