I was a big fan of Moon Reader but have changed over to Bookari (both under Android 8.1) because of it's EPUB3 support. It's an excellent tool for previewing and testing upgraded book files with full backward support for EPUB2 so I can check that they work well when released.

Guys I use aldiko reader and a premium one. You can get it from aptoide market and it`s one of the best I have seen. I hope this helps. However I don`t know about iOS based e-readers as it isn`t the same platform like that of an android. I am sorry for my English. Hope you understand.

ReadEra is my favorite

I'm also still searching for a reader but I found that with some Apps you just need convert your ebook. it's a bit tiresome but it work sometimes.

Reasily has been my favourite for a few years. sometimes covers reload every so often if your library is huge, but i love it

[SocialHermit]

"That's just retarded"
Seriously, do you think that using that word is okay? Educate yourself on why those of us in the Disabled community hate the use of that word as an insult! #EverydayAbleism

I really love my moon+ reader. I have had it for years. It has a great tag sorter, and I love the themes.
It's one of the only readers i use.
And kindle when I get free books off of amazon.
Hmm, I think anything there one I have used is called, Librera? Not sure on the spelling but the pro features are great.
But the most recent release of Moon+ has been my favourite overall.
I hope you find what you are looking for. In may even test out some of the ones that you mentioned, as In have not heard of them.