It's a matter of taste. The "TV remote style" Onyx remote gives you a lot of button options but it's a bit big.
A $1 Chinese "selfie clicker" can do page turns (only forward) but they all tend to sleep after one minute.
I think that the 8BitDo pads are kind of cute:
https://www.8bitdo.com/zero2/
You may need to change keymaps and/or modify your apps to behave how you want.