It's a common phrase used to express preference between two or more options.
Here are some examples:
* J'aime mieux le café que le thé. (I prefer coffee to tea.)
* Je préférerais rester à la maison. (I would prefer to stay home.)
* Elle aime mieux les fleurs que les bonbons. (She prefers flowers to candy.)
It's important to note that "aimer mieux" is often followed by a noun, pronoun, or verb in the infinitive form.