Things to consider…
1 Pricing
The apps have a range of pricing. Some are free to download with a core set of tools, and extras via in–app purchase.
2 Shooting modes
In addition to one–click shooting, the apps offer a variety of modes like time lapse, video and light trails. Consider if these are things you would use.
3 Editing tools
A number of the apps have editing tools and filters you can use after shooting to enhance your images. This can be useful if you don’t already have an editing app.
4 AI assistance
Some of the apps feature AI-powered tools like refocusing or auto analysis and enhancement of images, combining the shooting and post-processing stages. These can be a good timesaver.