Any updates or comparisons on this? I currently wait for my Batch 10 AMD Framework 13 and can’t decide between 1TB SK Hynix P31 and P41, price difference is only 5€.How much of a difference is it in battery life?
The p31 uses a gen3 pcie interface. So you will be limited in speed. Go for the p41 which is gen4 (as the motherboard) to gain full advantage of the pcie bus and SSD.
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The pcie 4.0 speeds of the P41 allow it to spend much more time at lower power states than the P31. You will see either better battery life with the P41 or damn near the same while not crippling the performance of your laptop.
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I ended up getting whichever of the P44 Pro or Platinum P41 were most easily available, and it happened to be the Platinum P41 today.
Not quite true, no drive will be “crippling” someones laptop, PCIe gen 3 speeds are nearly never reached in day-to-day usage.
Random writes and reads are quite similar between the two, which is the far more important metric! That being said, the P41 does have a better controller, so it performs slightly better 
Really though, all modern SSDs with cache are more than fast enough, and there is nearly 0 performance delta between systems with varied NVMe drives.
It actually depends on what you do. The speed of disks will impact doing some work on videos (experienced it myself).
On the FW16, when on battery, KDenlive is way faster when on power than when on battery. It can be really felt. Had to disable the slow down to gen3 when on battery in BIOS settings.
Sure if you only use it to browse, email, and other light productivity activities. Start doing heavy development work, video editing, or pretty much any work where you might need to bring a lot of data onto the device, and suddenly the difference is very apparent.
I recently upgraded from Hynix branded P31 to Solidigm branded P41 Plus.
Initial write speed is definitely higher with the P41, by maybe ~200MB/s more, until the buffer gets filled then they both fall down quite a bit. P41 might use a smidgeon more power, but not enough to make a statistically significant difference to battery life amongst the rest of the noise.
Read times are way faster with the P41. Loading a GIS project with around 4GB of data tiles, it opens and displays maybe 20% faster or so from the P41.