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Well either will be fastest with a 19/20mm tub - I know they say optimised to 23/25mm but that's nonsense. Both tubs and clinchers are getting hard to find in those widths so it's just down to personal preference really.
Edit - mind you it says that the clincher brake track is 23mm/17mm internal (body also says the wheel is 19mm wide...) - go clincher IMO. Not like the weight matters.
Hmm, not sure it's worth £499.