ETH is going to be the long term winner I think.
That development community has really stressed power consumption as a key focus the last few years. The BTC open source community is really behind on this.
I think after some major updates this year ETH will use much less than 1% of the power per transaction compared to BTC. ETH I think already uses a good deal less energy per transaction than BTC so if this update really cuts 99% of the power consumption like the dev community is saying that would be huge.
The cryptocurrency is going on an energy diet to compete with more efficient blockchains
spectrum.ieee.org
If they really do cut out 99% of their energy consumption I think ETH could really start to take off with more mainstream asset mgt firms that are scared to touch the asset class in part because of the bad PR around its energy usage.
There are already blockchains that are much more efficient than BTC / ETH but no where near as big. after this update ETH will be the second largest and one of the most power efficient.