I think both factors play a role
I understand we can use a Lee minus green (pink plastic) filter, to reduce the green in the Low CRI light, but that also reduces output… and it wont make a light with low R9 into a light with 90+R9, so I would prefer a High R9 CRI LED either way.
maukka has an excellent post about using Lee filters… here is one example:
I dont want to add a plastic filter to my lights, if I can buy a High CRI LED to begin with.
whatever the reasons
the observation remains:
Low CRI makes the wood color Less Realistic
High CRI makes the wood color More Realistic
another example,
left is NW High CRI, middle is NW Low CRI, right is CW Low CRI:
the High CRI LED produces the most realistic wood color