Not a fan of vertical tabs as truncated titles hurts my fov aesthetics. These days I will just pin the tab when I want to go back to it later but even that has it's limits too.
After a certain number of open tabs, the titles are less truncated with vertical tabs than horizontal tabs. You also have more of the titles in your center view if you have the text distributed in a more rectangular shape than a technically-also-rectangular-but-much-more-elongated shape.