Usually phone, especially for longer stories like those 300k word monsters on ao3, but for shorter stories (especially on AFF) I actually often prefer my laptop - it's easier with multiple tabs and commenting is so much more comfortable with an actual keyboard

Lol

I voted phone! But from time to time I read on my computer

Both but it's easier to read on the go via a phone ^^

the site's layout looks better on phone when reading.

I read using both of them but I feel more comfortable using my phone.

On both, actually! Just whichever happens to be closer.