On comparing Columbia's website information, at first glance, there seems to be very small differences between the Uturn resin and the Detour, except that the Detour is 600 grit surface and the Uturn is 200 grit polsihed. There are slight differences in RG differential and RG, but these appear to be VERY slight.
Ah! the stair-step core is inverted in the Detour. This is similar to the Banshee vs the Flash series but they used different coverstocks ...
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Bowling: Just like hand grenades and horse shoes, you only have to get close.
Life: Deal with what is.