Webflow css vs bootstrap 3

Hi all,
I have created a webflow html, css, and I am trying to convert it to bootstrap 3. Though I am not so sure If I should do this work, so I was wondering if anybody has experienced doing something similar, and what do you think are the advantages and disadvantages of using webflow css instead of bootstrap 3, in a solution.

For instance I was thinking manage animation with webflow, but other stuff like closing and opening boxes with javascript.

Is webflow is scalable enough?.. what disadvantages do you think I might have to deal with it if I use only webflow?.