In your context, the best relates to {something}, whereas best relates to a course of action. Plastic, wood, or metal container? What was the best choice for this purpose?

Understanding the Context

Plastic, wood, or metal container? What was best to choose for this purpose? Either is acceptable, and the practical meaning is the same, but their referents, implicit not explicit, are different. Both sentences could mean the same thing, however I like you best.

Key Insights

I like chocolate best, better than anything else can be used when what one is choosing from is not specified I like you the best. Between chocolate, vanilla, and strawberry, I like vanilla the best can be used when choosing from some choices.