I honestly like both characters, but that's just me.

I like Krell mostly because of Dave Fennoy.

Mysterio has his charm (though most of his character was spoiled to me, though fortunately not his most impactful deed), but I guess I liked him due to being the first live-action portrayal of Mysterio.

Thinking they're more of being Love-Hate Hate Sinks in general.

I don't really hate both characters