are two different things, so you can certainly have both. Survey systems by themselves are usually separate systems, which are either stand-alone or can be integrated into the Web site. Now, many forums also have polls already built in, but usually that limits the polls to being displayed only in the forums. Either way you go, yes, you can use both.
I am owing a website. And Im planning to redesign & add the Polls & surveys part. Since it will be strongly relevant to the target market of my website to keep them interested about the recent studies and the results. But I am also interested to have a forum. Is it a good option to keep both or any one. Please help me with your suggestions.