Currently there is no mechanical difference between Seldarine and Lloth-Sworn drow so that would imply the difference exists for reasons of dialogue tagging....but currently the dialogue seems similar.
Also the "Seldarine" drow are capable of worshipping any god that's not Lloth and most of the ones we're offered are not Seldarine.
I think Corellon, Eilistraee and MAYBE Sehanine are there? Don't remember seeing any other Seldarine god on the list of what the Seldarine drow can choose as a patron.
Also to re-affirm...my belief on the dark elf subraces is that most surface dark elves are going to mechanically be Wood Elves with small pockets being mechanically High Elves. And the "drow" elven subrace is going to be pretty much the underdark dwellers either Lloth-sworn or newly emigrated.
Eilistraee is a Dark Seldarine, so if we were to go by the description, Seldarine drow don't worship Eilistraee. You know, the go-to "good drow" deity.
I think surface drow would be physically drow, so would get "stranger reactions" for drow and culturally more or less like high or wood elves - Baldurian tag.
If we were to divide by "Underdark drow who are/aren't Lolth fanatics"... I don't know if such division makes sense? Given we have many archetypes within each (sub)race and the other ones weren't divided.
Of late, Eilistraee is now counted among the Seldarine and her divine realm has moved to Arvandor among the other elven deities. I'm not sure her old domain in the Demon-Web Pits even exists anymore.
Downside of this is its going to make it more difficult to reach out to the drow still under Lloth's thumb since it feels like that'll make it easier to keep her influence and call away.
At the moment, the Seldarine / Lloth-sworn difference doesn't make much sense because there's apparently neither much difference in mechanics (0 difference) or narrative (seems to be the same sort of dialogue).
I kind feel that if Seldarine Drow were renamed "Apostate Drow" or something similar...it would make more sense even if it wouldn't be especially accurate given what the actual definition of apostate is.
The difference between Sun and Moon elves is quite a bit more distinct and feels like it should really be a thing, but eh...it's a CRPG, I don't expect too much.
