Which is best. Bootstrap or Metro UI css?

Question

I use bootstrap but recently discovered Metro and seems nice.

Answer 1

You decide what framework is the best for you. For a web developer it is important to know several css frameworks.

Answer 2

Adding something to Igor's response: the choice also depends on the native style of the framework and the components it offers. If the style of the framework adapts to what you want to do, it will possibly save you a lot of work.