id go for the zipps. heres why:
enve preaches the linear relationship between side wind force and steering force. the actual steering force exerted on a zipp wheel is lower than with an enve wheel. with a zipp wheel, beyond a certain wind speed/yaw angle, the force drops off, which enve says is unpredictable. but that is also what happens with a classic box-section rim, so IMO, even if it's not LINEAR, it's not unpredictable. and it's lower.
internal nipples on tubulars blows. hell, internal nipples on clinchers is bad enough.
i dont believe molded spoke holes are better. carbon fibers dont work well with bends in them, especially along the load path. i have a feeling that enves molded spoke holes and internal nipples have to go together. i have a feeling that they cant easily go with molded spoke holes if the holes are big enough for nipples. it could be too much bending, too much distortion. just my theory, of course.
if going with enve's specified hubs (dt), i prefer the zipp hubs. they have much less resistance (even vs the 190), better spoke bracing angle, bearings support the axle better, and lighter.
and the firecrest wheels in general have been super reliable, super tough. hundreds have come through the doors. i cant say that the enve 6.7 havent been, not enough have come by.
Good points. I saw the torque graph comparing the enve and zipp wheels, and the enve, though linear, has much higher torque overall. I think zipp's approach makes much more sense.
Any recommendations for tires/glue? I've been using 23mm evo cx and they are so-so.