Feature Questions

Can you selectively move/upload files to storage? Or does it move everything that’s uploaded?

There’s filters for that …

as3cf_allowed_mime_types:-
https://github.com/deliciousbrains/wp-amazon-s3-and-cloudfront-tweaks/blob/96d9fc03ffcfdc1d2e77b0a1a53891e6e1a76e30/amazon-s3-and-cloudfront-tweaks.php#L387

or …

as3cf_pre_upload_attachment:-
https://github.com/deliciousbrains/wp-amazon-s3-and-cloudfront-tweaks/blob/96d9fc03ffcfdc1d2e77b0a1a53891e6e1a76e30/amazon-s3-and-cloudfront-tweaks.php#L437

Does either version have WP-CLI support?

No, WP Offload Media does not add any WP-CLI commands, yet.