Hello - to date I have used the Pro 20, 21 and Max with Davinci Resolve Studio. Conclusion: The more RAM the better - but it always depends on your projects and the complexity. Personally, I didn't feel the difference between Pro and Max in terms of CPU very strongly, but RAM (64B) was clearly noticeable.

I already own this laptop and I would say that if you don't do video editing for a living and every minute counts, the M1 Pro will do just fine. You can hardly break a sweat with the M1 Pro, let alone on a regular basis.

The only thing that really matters is that it's a 512 GB SSD or more, because 256 GB each are on one chip and from 512 Apple uses quasi dual-channel access, because two chips can be read and written in parallel. Also consider that fewer cores and power means longer battery life and less waste heat on the legs and less fan action. This doesn't show up in any benchmarks, but it's really a point that you notice more in everyday life than one or two more cores.
In addition, the M1 Pro is stronger, especially in graphics. The CPU cores are identical to those of the Pro and the Max only has two more. Do you really manage to use 32 graphics cards regularly for video editing, so that the disadvantages and the costs are worth it? Probably not.
In addition, with the M1 Pro, a hardware media engine for video encoding has been added to the SoC, which does the encoding (but only on customised software). This makes graphics performance less important again - it is less involved.

So in short, 4K is a piece of cake with the M1 chips. You can even do it on a MacBook Air. And more battery life and less fan noise and waste heat are clear arguments in favour of the M1 Pro. If you do video editing professionally, i.e. all the time and with more complex effects etc., then you can work a little faster with the M1 Max and in some specific moments a little faster.