For mounting, I have to agree that the kitbot excels. All those patterned holes in the horizontal flanges are ready made for easy bolted attachment of almost any mechanism or belly pan. The vertical surfaces leave a bit more to be desired, but overall mounting options are plentiful. Trying to mount to WCD tube seems like much more of a design challenge, especially for subsystems intended to be removable for repair or swap.
From a design perspective, the flexibility of positioning gearboxes and wheels seems like a pretty big advantage for WCD compared to the limited options with the kitbot. Is that advantage critical compared to the simple build and easy mounting on the kitbot for most teams? I wouldn’t say that it is. For teams that have plenty of skilled design resources and take extra pride in a full custom design rather than just custom subsystems, going with WCD is a fine option.
Interestingly, where the primary question was kitbot vs WCD, it looks like the question may be changing to kitbot vs swerve. It will be fun to watch that play out over the next few years.