Looking at various site's nav bars I see some sites spread their content wide across the bar, anchoring their logo to the far left and login to the far right, navigation in the middle (examples: squarespace, medium). And some sites align nav bar content to the main content grid (examples: campaign monitor, ny times).
Are there reasons why one way is preferred over the other?
I can't find any information on which is best for usability on a responsive site.