I have both, I do not think these are close.

Uproar imo has a more pronounced move off the breakpoint.
PunchOut skids longer thru the front/mids and has a smoother response to friction. However, I see your logic but would still constructively debate your inquiry. :-)

I do think the IQ Tour Nano/Marvel-S are close.
The IQ Nano I have is pin above middle, while the Marvel-S pin above ring (no xhole on either), and I have the IQ Nano a shave smoother off the break (than the Marvel-S). The Marvel-S has more overall traction and has the edge in amount of volume it handles, but again based on your question... these are really close (for me). I would defend that given a few variables (personal finance, if you are just a fan of Utah, or you like to have tight tiers of equipment), these two are different enough that a Marvel-S enthusiast will notice variance.

Other notable close balls (depending on volume/your axis tilt/speed):
IQ Tour vs. Zero Gravity
Lights Out vs. Original Hyroad (I'm ONLY saying this because I use them both in tandem, with almost identical layouts... where the Lights being just under the Hyroad given ample volume.