Very efficient.
This recent Lake arrowhead trip I did, I brought iPhone Pro with SD card lightning adapter, as well as my MacBook Pro laptop. I didn’t even take my MacBook Pro out of the bag. I found that importing my photos into iPhone Pro, and quickly using Photos to flag and favorite my best photos, and upload to my WordPress media library is the most efficient. Looking at all the photos a small thumbnails, and selecting my favorite photos based on what pops out at me with the small thumbnails.
Also some thing that I found efficient is with iOS, you do not need to re-export your photos. Because it is all synced in iCloud and Apple photos, you could directly upload to your WordPress media library without a second step. Therefore in this way, using either an iPhone or iPad removes a step from your photographic workflow, even when compared to a MacBook laptop.
Other nice details which I appreciated include hanging out on my Airbnb porch, in the direct sun, while flagging my favorite photos. Rather than being stuck indoors with a laptop.