I don't care where I read it if I read it online, but if it's long (for me long >12k words), I don't read it online, I save it into mobi format for my Kindle. In which case, I prefer it be posted somewhere that it's on one page such as AO3 'coz it's easier. Though I certainly have done the cut-past-next page route for many fics. Really sucks when it's dozens of chapters.