This is very good instinct, and you could. It is also a superlative, like greatest, or highest, so just as you would use it as an adjective to show that something is. In the following sentence, however, best is an adjective:
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Which one is the best is obviously a question format, so it makes sense that which one the best is should be the correct form.
Your example already shows how to use best as an adverb.
You could certainly declare that after. Best wishes to you：我真诚的祝福你，祝福您； best wishes to：给。。。。最好的祝福； 例句:please convey my best wishes to him.
