SDXL EPSILON: SDXL Delta with Cybernella's Amazing Portraits XL baked in, plus a couple of cinematic enhancers.
SDXL DELTA: I combined NQP 3.0 with NQE 3.0 and then I added some of Prodije's Fabled Illusion to the mix, since I like how it handled dark images.
SDXL 3: tends to be more photorealistic and a little better at SFW content that previous versions.
SDXL 2: A merge of NQP 1 and Juggernaut XL
SDXL: A merge of the SDXL Photoboobs checkpoint with a couple anime/art SDXL checkpoints. I'll probably make a new one - this one has a very high bias toward making white people over other races/ethnicities.
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SD 1.5: v2.4: Was made with the Draw Things app back when Draw Things' checkpoints didn't always play nice with others. Avoid unless using said app.
SD 1.5: A veritable soup of checkpoints I should have catalogued. These are a few that got mixed and re-mixed until I found a checkpoint I felt comfortable sharing:
https://civarchive.com/models/2661/uber-realistic-porn-merge-urpm-legacy-version
https://civarchive.com/models/79570?modelVersionId=84383
https://civarchive.com/models/18637?modelVersionId=191384
https://civarchive.com/models/219439?modelVersionId=247432
https://civarchive.com/models/5245?modelVersionId=6087
Most of those are pretty horny checkpoints, so I'm gonna guess that NSFW stuff will come easily with this checkpoint, although I haven't checked that out yet.
Description
2.4 (the first release since 1.0) brings in more film grain and photographic aesthetics, while subjects remain in the uncanny valley.
I'm not sure it's an improvement, per say. You can look between the two to see which you think would work better for you.