Ive been using Calyx for about 2 years. Moved from IOS to it and it was a really easy move. The OS is nice and smooth and you can have two profiles running different apps / threat models etc.

Ive not tried Graphine, but if I was doing it again today based on what I have read recently I would install Graphine and not Calyx.

Graphine seems to have majorly improved as a daily driver with their play store sandbox. Calyx is also very slow on security updates.

When I change my phone next I will be trying out Graphine.