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It's in the video, 10% quicker boot of Chromium vs. via USB3 and much faster file copy

Preferably all 3: USB3 bridged NVMe, USB3 bridged SATA, and USB3 flash

I've done all three a number of times... just never synthesized all the results.

I did update the post with a benchmark I forgot to include—NVMe direct is 10% faster than the NVMe-to-USB 3.0-to-Pi adapter, so there is definite and easily-measurable overhead loss in the protocol translations.

Plus the potential (I don't know... but some people say it could happen) for different weird issues to present themselves when going from PCI to USB to PCI again.

would be good to see a real fs benchmark too - os boot & chromium launch have tons of other stuff going on which obscures the actual io speed.

I mention in the video the fio and iozone benchmarks I did on my previous 'tiny nvme raid' video.