They are the only two that aren't just PWA crap. 

At least with Amethyst you can use Amber signer and Citrine local relay so your drafts stay on your phone and don't get broadcast to the entire world and your nsec stays secure. 

Having to enter your nsec into progressive web apps is a major secret risk. 

https://github.com/greenart7c3/Amber

https://github.com/greenart7c3/Citrine