jQuery: $('#id tag') vs. $('#id').find('tag') - which is preferable?
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I feel the title may say it all, but... I want to know which option is better, particularly in terms of their speed:

    $('#id tag')...

or 

    $('#id').find('tag')...

Also, would the same answer apply if you change `id` and/or `tag` to, say, a `class` or something like `input:checked`?

For example, which is better: `$('#id input:checked')...` or `$('#id').find('input:checked');`?

Thanks.