I never could find a definite answer between what the difference is theoretically between 7...Dc7 or 7...Sb6 in this position:
I know that generally 7...Dc7 is more tactical and crazy and requires more memorisation, but 7...Sb6 has some weird variations too, although it looks solider. I do not know much about how they are now, but last I checked, both were theoretically fine that White has problems proving an advantage here.
I read Awrukh's Slaw bookk which recommends 7...Dc7 and became interested in 7...Sb6 after seeing Markus Ragger's video series on Chess24:
https://chess24.com/es/learn/advanced/ebook/slawische-verteidigung-ragger/13although this one you need to know some German.
Would it just be that solider players choose 7...Sb6 and more tactical the 7...Dc7? I have seen Olga Girya play a nice game in 7...Sb6 where she marched her king up during a multi-piece endgame in the Tromsø Olympiad last year, and she seems to play it regularly. The Chinese elite GMs seem to play 7...Dc7, but in general I do not get 6. Ne5 so often, so I do not have too much experience in this line.
I generally play the Slaw to be solid and safer, the Grünfeld when I want complications. Or is it the case like between ...e6 and ...e5 in the Najdorf, a matter of taste, and some using both regularly depending on the opponent?