I would definitely go with bootstrap. It´s easy to get started, well documented, supported, responsive, mobile first…
If you want to read more to compare both frameworks I found a good discussion here
Also have a look to the twitter bootstrap components so you can get familiar with them. It has a lot of features out of the box and there are really good marketplaces out there where you can buy amazing bootstrap templates ready to be used.
Hope it helps!
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solved which is best for designing forum website – bootstrap or materialize? [closed]