I remember, I was on holiday 4 or 5 years ago. I was sitting at the bar having my morning coffee and browsing reddit and I was getting annoyed that if I went to get a drink from the bar when I came back and turned the screen back on it would reset my position in the comments.
So, I asked around and was recommended RIF. Not only did it keep comment position, but it was just all round in every single way better.