Yes, valoir mieux requires the subjunctive:
Il vaut mieux qu'il le fasse.
It would be better that he does it / for him to do it.
The Subjunctivator! | Quiz: Subjunctive or indicative?
Expressions with mieux
Does il vaut mieux que need the subjunctive?
Verbs, expressions, and conjunctions that require the French subjunctive
By Laura K. Lawless, About.com Guide
French Subjunctive
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