To say that you like something more than something else, say that you 'like [something] better than [something else]'. To ask what someone likes better, say "Which do you like better?".
- Which do you like better, baseball or basketball?
- I like baseball better.
To say that someone/something is your favorite person/thing, say that you 'like it/them best'. To ask someone what their favorite person/thing is, say "Which do you like best?"
- Which sport do you like best?
- I like baseball best.
To intensify the comparison, add “much” in front of the comparative word:
- You are much taller than Tom. (= You are a lot taller.)
- You are much more active than Tom.
Double comparatives is the use of two comparative words separated by 'and'. They describe gradual increases or decreases.
- You are growing taller and taller.
- Fewer and fewer students are going abroad to study.