I am a wedding photographer that is interested in having full control of how my users view my website. It was very important for me to have a quick loading gallery that also opened the images quickly in full screen to showcase the quality of the work. I think hands down the JIG thumbnails + Photoswipe is the best way to showcase photography on WordPress. The fact that it easily integrates with real media gallery is the icing on top making WordPress feel like an actual full photography website. I have been running some tests and Google definitely likes the way that JIG is serving up my image thumbnails with alt tags and descriptions. It even links to the high resolution version, so it's a win for search engines and my users! I have been recommending it as “the best WordPress gallery” to all of the Facebook groups I am part of!