I have been hearing a lot in regards to landing pages or blog roll on websites and in my opinion and experience there is no reason that you cannot use both. I have seen my bounce rate get better and my read time get better just by using a mix of the site's setup.
I understanding that this is all about your niche on which is better however using both gives the reader a better view point and take away from distractions.
This is a video that put together to show a mix of how I shift to a three part screen to a full width screen and also the way I use my blog roll.
Let me know if this helped you.