title: How can I choose between Client or Pool for node-postgres
body: <p>From <a href="https://node-postgres.com/features/connecting" rel="noreferrer">https://node-postgres.com/features/connecting</a> , seems like we can choose between <code>Pool</code> or <code>Client</code> to perform query</p>
  
  <pre><code>pool.query('SELECT NOW()', (err, res) =&gt; {
    console.log(err, res)
    pool.end()
  })
  </code></pre>
  
  <hr>
  
  <pre><code>client.query('SELECT NOW()', (err, res) =&gt; {
    console.log(err, res)
    client.end()
  })
  </code></pre>
  
  <hr>
  
  <p>Their functionalities look very much the same. But, the documentation doesn't explain much the difference between <code>Pool</code> and <code>Client</code>.</p>
  
  <p>May I know, what thing I should consider, before choosing between <code>Pool</code> or <code>Client</code>?</p>