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.
