Question For Digital Readers

For the digital readers, on which platform do you read and why?

Phone, eReader, tablet, iPad etc.

I personally have been reading on my iPhone but it feels a bit.. off lately. Can’t pinpoint what exactly it is.

Was thinking to purchase a tablet or eReader but uncertain which one and if they’re worth to get for only reading.

EDIT: Thanks for all the responses! I’ll look into them all!