Pinning a screen allows you to disable active speaker view and watch a specific speaker. Pinning another user's video will only affect your local view in the Zoom Room, not the view of other participants, and it will not affect cloud recordings.
Spotlighting a video puts a user as the primary active speaker for all participants in the meeting and cloud recordings. To spotlight, you need at least 3 participants in the meeting with their videos on. Spotlighting can only be done by the host.