meaning - How does "would" work in a sentence: The best choice would be...?

In the sentence "the best choice would be...", what does "would" mean in the following sentence?

Questioner: Is this sentence correct? 'Finished eating, we went to the zoo'.

Answer: I'm afraid that is not correct. The phrase 'Finished eating' is a participle phrase with a passive meaning and you need an active meaning here. The best choice would be 'Having finished eating...'.