Indeed, that’s also my impression. These seem a bit easier to work with, but I’ve just started exploring the possibilities so I’m not sure yet.
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I posted in the other thread, but judging from the films I know these are out of the box colour wise closer to what I expect.
The agx filmsim have halation and grain that are critical to the film look and very close to what I expect.
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ART has both as well, although I don’t know how convincing as I’ve never really shot film (well I have due to age but I was not into photography at all at the time 
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I am actually in the same boat. Since I really don’t know the film processing at all I am sort of guessing and playing with all the settings in both projects and just trying to land on something that I like but I really can’t target the adjustments at all at this point. I must say I have created some really nice results that I like the look of I just have no idea if at all its film like or just a pleasing digital image…Thanks for making all these options accessible in ART…
I actually don’t know it it’s the case but from the results I gathered that agx had halation and grain tuned to each film. This was a straight up assumption that I didn’t question, may well be wrong. Whether this is a pro or con depends on the user.
Just out of curiosity, with the Film Grain effects in ART - Do these have any bias towards shadows/highlights? A bias slider could be a nice addition if possible! With Negative film having more pronounced grain in the highlights, and vice-versa with positive film.
Also regarding JanLohse’s spectral film sims - it’s great to see so many supported colourspaces!
The grain is dependent on luminosity, but it’s always applied to the positive image at the end of the pipeline, so the effects you mention won’t be possible. However, the “add noise” mode of the smoothing tool uses the same algorithm as the grain tool, and it allows to control its intensity with any kind of mask, so you could probably approximate what you want with a bit of work.
It’s great if you use the tool directly to generate Luts. If you use it from art, it doesn’t really matter as this is handled automatically for you.
HTH
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