Hmm, I dunno. I probably veer toward "more attractive" whatever that means) when I make sims out of whole cloth. Sometimes they're based on real people tho, so don't end up quite as "pretty." I have two sims I based on myself for instance--one that was basically me (tho not entirely lol, I can never quite bring myself to do that) and one that was a combo of me and my best friend. The former was also an alien ;-P Anyway, I dunno how "good looking" they came out since I was basing them on real life features.
https://i.imgur.com/L46pgdB.png
https://i.imgur.com/oKiiYiE.png
https://i.imgur.com/pPX2O8I.png
https://i.imgur.com/yNOF92s.png
I did make some vampire sims that I think came out pretty gorge, but that was kinda the point, lol. Two of e'em look alike, but they're supposed to be twins ;-D
https://i.imgur.com/CZPZ7s7.png
https://i.imgur.com/GkK8ZRv.png
https://i.imgur.com/kiYoBFX.png
Most of the sims I make in CAS are based on fictional characters tho, like from tvand stuff, so obviously they tend to be pretty attractive ;-P But then, they're based on actors, so, yeah. I did make some Game of Thrones Houses inspired sims, that weren't based on any single character but more my general impressions of the houses. Some of those came out sorta interesting.
https://i.imgur.com/Txc5zls.png
Anyway, interesting discussion!
