Luis Martinez-Suarez

I don't know about material design.

You would go with Bootstrap if you want to prototype / build something without bothering about the design at all and you are OK if everything looks kinda template-y, using bootstrap out of the box components.

Go with Tailwind if you need a sleek design, a user interface where building with components will be important (because tailwind strongly favors component-based UI), and you know you will need to extend the built-in classes with your own (because tailwind is very easy to extend)

I would personally recommend tailwind over bootstrap any day of the week.