There's also an other reason to go with the "almost released" one when starting a new project: bootstrap has been historically painful to migrate. Upgrading ma

There's also an other reason to go with the "almost released" one when starting a new project: bootstrap has been historically painful to migrate. Upgrading major bootstrap version means changing class names in whole codebase (like the classes for grid system), changing html code for some components which have been updated, and having to remove other components altogether and go with your own sauce because components were removed. This has been the case for all previous major bumps, and there is no sign of it being any different this time, so better save a migration and go straight with bs-4.