There has been some excellent feedback on this topic already. I just want to point out a distinction that has been glossed over - OSX laptop users have a very different scrolling experience than Windows users (laptops or desktop). The two finger scroll method is very pleasant, and highly accurate. I don't ever have to re-find content while scrolling, because of how tactile and accurate the feedback is.
As interfaces get better, I believe the vertical scroll method will be preferred, because it allows the user to quickly skim, jump ahead, or reference previous content, within the same context.
To be fair, I had forgotten how different scrolling is with a traditional mouse. This design trade off (arrow keys and next buttons) is probably excellent for windows and traditional mouse users.
As interfaces get better, I believe the vertical scroll method will be preferred, because it allows the user to quickly skim, jump ahead, or reference previous content, within the same context.
To be fair, I had forgotten how different scrolling is with a traditional mouse. This design trade off (arrow keys and next buttons) is probably excellent for windows and traditional mouse users.