LESS vs SASS?

I am going through the JavaScript curriculum and I’m currently going through the CSS Preprocessors lesson in the HTML/CSS Course.

The lesson talks about the pros and cons of both LESS and SASS. It seems like LESS would be preferable to someone that uses JavaScript, while SASS would be preferable to someone that uses Ruby.

Am I understanding this correctly? I was going to move forward with learning LESS since I don’t know Ruby, but the course seems more focused on learning SASS.

I’d appreciate some insight here. Is one preferable to the other, or is it really just a preference?

Thanks!