New vertical tabs are great, would be cool to separate pinned tabs from normal tabs to be able to use the space more effectively. I usually pin tabs I need to go later or have them pinned for everyday usage and it takes almost the whole horizontal space, it got better with vertical tabs where I can scroll the pinned tabs. If we had the option to use horizontal and vertical tabs together, this would be the best fit. Everyone could set where which type of tabs they would want.
I would have pinned tabs vertical and normal tabs horizontal.