Please vote to close (or not) based on the question in its current form.
This is especially important with migrations (“belongs on …”), because having a question migrated then closed is a far worse experience than closed on-site. When a question is migrated from site A to site B, it is closed and locked on site A and created open on site B. If site B closes the question then it is locked on site B and unlocked, but still closed on site A. Edits and comments made on site B are effectively lost (you can find them if you dig but they aren't visible on site A).
If you think a question would be suitable on another site after an edit, make the edit first, then vote to migrate. If you think a question could be suitable on another site but it requires an edit from the asker, vote to close without migration, and leave a comment like “your question is off-topic here because … and also lacks …. I suggest that you clarify … and then repost on ….”