This is more evidence for what I've been saying so far. Atmospheric planets seem to have the necessary tech for decent mountains (and canyons?) but not so for Rocky and HMC non-atmospherics. Again, I'll be very happy if someone finds some.
Back on thread topic, although atmospheric planets are better in other ways, they still have the "repeating tile" issue, the same as non-atmospherics.
Yes, it does has atmosphere but it shows that the Odyssey Tech is capable of Kilometer high ridges and Mountains. If it can do it on a planet with atmosphere I don't see any reason why it shouldn't be able to do it on a planet without one - unless the valuas are set to not do so.
Which is why Pomeche is interessting, it has more extreme height diffrences but they also manually increase the values on that one planet to get that. Meaning the general value for that planet type is too low set in general for a planet like pomeche to get kind of terrain without manual adjustment.
But I'm also not sure its about atmosphere, to me it just seems the numbers for planets types are set diffrent compared to Horizons. Best Candidates for big canyons and Mountains in horizons where small, low gravity Icy/rocky Ice planets. 500-800km radius seemed like the golden spot me, but it could happen below or bit above that, with the gravity being below 0.1g.
To a bit lesser degree also rocky ones, but HMC never really reached the heights of those (and definitly not Metallic ones, but that seemed right for that planet type)
I have found a couple planets/moons in that range but with atmosphere in ody and they where pretty much the same as the ones without atmo in ody of the same type. The planet from the pics above where I'm currently on is a HMC planet of 1000km radius and 0.14g - I'm pretty sure I never found anything of that height on a planet like that without atmosphere in horizon.
So yeah, I do think we have a case here of not just the terrain being a bit diffrent (ody planettech seems to go the high km heights in much more gradual way then those of horizon) but also those kind of hight diffrences seems to have shifted away from the small icy ones, I have yet to see one providing anything close to the same of horizons, being with or without atmosphere.
Which by the way just doesn't seem realistic at all. When I come across a small icy moon of 600km radius and 0.05g in close orbit of a gas giant and he hasn't much going on other then a few craters and hills that seems weird. Giving the low gravitiy of the planet and the high gravity of the gas giant pulling on him there should be more happening there.