I was waiting for a clarification on the poster's meaning of "oomph". Usually we use that term to mean something about "goes faster" or "does more" or "pulls harder".
Comparing the SoCs of the RPi4 to the iPad Pro, the Pro's A12Z has 8 cores vs the 4 of the Pi's Cortex-A72, more L1 cache, way more L2 cache, 8 GPU cores on chip (vs the Pi's separate GPU (which has at most 4 cores)), etc. etc.
The only meaning of "oomph" which I could imagine that would put the Pi ahead of the iPad would be in flexibility in terms of what can be done with the device.
> The only meaning of "oomph" which I could imagine that would put the Pi ahead of the iPad would be in flexibility in terms of what can be done with the device.
That's exactly the point.
A RPi is currently much more flexible than an iPad for some workflows that need a terminal or desktop software. For this use case, the iPad acts as a self-contained power supply, internet connection and thin client.
However the iPad's own capabilities are recently improving with the new features of iPadOS.