I can’t decide what I want to use LOL …
When I started shooting again after getting a new camera in late 2020 (I shot a bit in the mid-2000s), I invested time learning RawTherapee. Not that I’m a master but I’m not totally lost. 
I’ve poked around in ART but not invested serious time (yet). But to add to my confusion after two abortive dalliances, I invested time in darktable. To my eye the three sort of sit at different places in the FOSS raw editor continuum:
ART: easier to use, power is under the hood ----- RawTherapee: more dials and gauges but they look familiar ----- darktable: align the dilithium crystals and clear spacedock, Mr. Spock
Yet darktable is statistically where I spend most of my raw time. But if I look at it objectively I’m not sure why…
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Yes, darktable has a linear / scene-referred workflow. From what I understand that’s a Good Thing. But truthfully, my level is so far below that strata that it’s only one small factor of many when it comes to the final image. It’s not like I have these world-beater photos just screaming to linearly processed…
(and I see lots of good results from other editors) -
Yes, darktable has DAM capabilities… but I simply don’t need nor use them. XnView MP and / or Fast Stone do everything I need WRT browsing, managing, etc.
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An advantage darktable has over RawTherapee is full support of CR3 metadata. That causes annoying (but ultimately not insurmountable) issues with a RawTherapee workflow.
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A disadvantage of darktable is, it’s slower.
And then (on-topic!) there’s ART, which fully handles CR3 metadata and is apparently a bit simpler to use than RT. At this point my relative lack of motivation to seriously go after ART is two-fold:
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ART is a one-developer show. Alberto is from all indications a superb, responsive developer and seriously nice guy. No worries nor negative implications there. At all. But he’s also indicated he’s doing ART for his own interests. And what if something beyond his control was to force him to curtail ART activities?
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ART’s user footprint is smaller, which means a smaller Internet “resource base” for instruction, guides, tutorials, etc. But the more I learn in general, the more I’m able to figure out for myself so maybe this isn’t as much of a factor after all.
I know… all three are FOSS and I tailor my expectations / approach accordingly. If I had the resources to help, I’d love to be on a team. But I love choice and having all three available is seriously great.
Hmmm … …