To put folk on what they do best. That is, put your staff who work on web site on the web site work. Then you deal with products, manuals and the business. I've used some dozen site builders over the years so to me any of these are great since they mean I'm usually not writing HTML.
As the owner of the small startup company, I have chosen to use website builder, which would be either RVBuilder or site.pro. Having done a little research, I have found out site.pro is a very easy to use drag-and-drop simple site builder with bounded choice of templates. Whereas RVBuilder has many more templates to offer, but very complicated in use.
Has anyone had experience with those two? Any recommendations or advice?

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