I want to read more M/M Romance so I’d like to ask the community: what are the best e-readers to read A LOT of M/M Romance?

I love reading physical books, but those are very expensive where I live since I have to ship them internationally. So I’d like to start reading virtually and would love to hear your recommendations for the best e-readers to read a lot of M/M Romance. Which ones have the most expansive libraries for this genre? Kindle? Kobo? Another option? Thank you so much!