MG2009, unfortunately, has USB 2, not 3. Given that scenario, Thunderbolt would be the fastest way to go, by far. If budget permits, get an SSD instead of an HDD. I have two HDDs in a Thunderbolt enclosure (one clone and one Time Machine) and two SSD clones in another Thunderbolt enclosure. The difference in speed is startling. The HDD clone takes a relatively long time to boot while the two SSD clones boot almost immediately. The time to update the SSD clones is literally one-third the time that it takes to update the HDD clone.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
| 
