I've asked this multiple-sites question a lot....and have gotten conflicting answers. Some say you're better off to invest what time you have (which is finite for everyone) into one domain - which supposedly adds a bit synergy to your efforts because all your work is going into one site. I guess the idea being that one website with 100 pages is better than 100 websites with one page each.

Yet, I still hear some people say, like in this thread, to go ahead with the multiple-site strategy.

Is one approach any better than the other?