That's wrong. Can you provide a case in which the audio correctly identifies planets and the holo does not correctly identify them? I'm pretty sure the answer is "no".
Er, no it's not wrong, the answer is actually "yes". If I want to find an ELW, the audio will tell me
definitivelyif it an ELW or not; the holo-graphic will only tell me if it is an ELW or AW, or something else, but can't distinguish between ELW or AW. With the audio every planet type has a different sound; not every plant type has a different holo-graphic, therefore the sounds are more accurate.
I note that the second holo-graphic (the Radio Sidewinder one, not the one you referenced) distinguishes between different atmosphere types for HMC and rocky bodies, which I don't know if the sounds do.
Besides ELWs and WWs being easily distinguishable on the system map, the holo scanner will identify which one you have, 100% of the time.
You've gotten good at using the audio. The holo viewer is going to be easier for almost everyone.
With the audio I don't need to leave the system map to confirm if it's a very blue WW or a true ELW, or in fact any other type of planet. To tell the difference between ELW and AW, or certain HMCs and rocky bodies, using the holo-graphic you have no alternative but to scan it or consult the system map. Easier is a subjective term.
But in the end this is splitting hairs - both methods add richness to the game, I'll probably use the holo-graphic chart for curiosity after using the system maps and sounds for verification. You'll probably do different - that's why they say "blaze your own trail."
Happy hunting