The rk3399 devices are definitely on the better side of open source support. A large part of that has been rockchip's been more open than other vendors recently

The rk3399 devices are definitely on the better side of open source support. A large part of that has been rockchip's been more open than other vendors recently, but its still AFAIK not as clean as you suggest. As far as whether the celeron is better or worse power wise, I couldn't answer. But for sure I wouldn't make such sweeping statements. A lot of people think ARM=low power, but the power mgmt on these more "open" boards is actually quite bad. A large part of that is simply the fact that mainline linux is missing much of the finer points of controlling these boards. So, maybe the board could be X watt's with a given workload, but due to the lack of frequency control on the memory controller (or whatever) it ends up being 5-10X. The intel boards tend to be much more dynamic at this point. For example, comparing an rpi4 and an atomic pi, you wouldn't expect from the massive heatsink on the atomicpi that it ends up being much lower power than the rpi4 for quite a number of workloads.