What is more popular now SASS or LESS?

Question

css

I understand that the question is stupid and probably already asked (although I didn’t find it in similar ones here), but still the situation is constantly changing, the tools are developing and the answers that can be found in Google have probably lost their relevance. What is currently more popular and worth studying first? Why?

Answer 1

Less - 9,051,733 available code results
Scss - 9,744,238 available code results
Sass - 311,623 available code results
Stylus - 311,251 available code results
scss+sass = 10,055,861

Answer 2

Well, for example, Bootstrap 3 uses Less, and Bootstrap 4 uses Sass