I thought about it and I find ''better'' more suited to things that are measurably superior or at least more than a subjective opinion.
Girls are better than boy. We looked at both results and their grades are higher
Diamond is better than quartz when making rings. It's harder to break, and shinier.
I believe stone is better than wood when making countertops. You know it to be easier to clean for example. There's reasons you're aware of before making this sentence.
I like stone more than wood. To me it's first a preference but you probably have reasons too.