BAB. Buffy 1.0 was a Bosmer using BAB. BAB is nice in that it is elven petite. Notably, the hands and feet are delicately done and one of my favorite features of that mod. It is not particularly well supported for outfits however.
HGEC. As things advanced, I became unsatisfied with what I could do with vanilla race face textures and got quite tired of avoiding close-ups and taking great care with lighting to avoid blotchiness for screenshots. I found a fabulous custom race – but it required HGEC. So Buffy 2.0 was born with her own custom race and body by HGEC. Naturally, for Buffy I chose the smaller cup and hips sizes. Her height of .88 also helped give her a smaller and more delicate look - but I still found her a bit ‘chunky’ compared to what I had hoped for. When I set her race’s
weight to 80% of an Imperial woman, magic happened and we had the wonderfully elven petite body that I wanted again.
HGEC does have a more pronounced hourglass shape than most other body mods, but when combined with the smaller hips, bust and weight I’m using, I’m quite happy with it. Her current body is a bit more blossomed or womanly than her earlier BAB body, and I chalk that up to her maturing from teenage elf into young womanhood.
Less than ideally, her hands and feet are still a bit more manish than those delicate feet and hands that BAB did so well.
We use the EVE variant of HGEC, which provides plenty of ‘sizing’ options and also converts all the vanilla outfits to your selections. This ensures all the vanilla outfits fit well. As far as modded outfits, they run the gamut. The bad news is that there are indeed tons of skimpy and/or overly voluptuous outfits to wade through. But because HGEC is hands down the most supported body mod, there are also plenty of appropriate outfits for more slender girls for those who take the time to wade through things carefully - I think Buffy's massive wardrobe is pretty good evidence of that. While I think Buffy has a delightful little figure, I don’t think she’ll ever be convicted of being busty or voluptuous.
TGND and Roberts. I’ve used neither, but certainly evaluated them from screenshots and discussions. Both seem to be geared toward a more realistic shape, rather than the somewhat waifish body of BAB/vanilla, or the rather idealized hourglass of HGEC.