I'd take the good site.  I paid my money, quite a big chunk of it, so I don't see any reason to move on (andwhat if they didn't take the goodsite after all- then I'd be feeling likeapretty big fool).  If a big group want's to be sure to get that nice big site, they can send one of thier canoes ahead to claim it - get up earlier than I do.  Even more so if I was planning on more than one night at that location.

In part, that's mostly because I tend to travel late, and if I hit camp at between 5 and 7 pm, I'm not at all inclined to give it up for a maybe not taken site at next lake - noisewise, since the sites are within hearing of each other, its gonna be noisy anyway, and I'd be getting mad at myself for giving up a nice site to a noisy group (if it turned out that way, and like someone said, more likely than not a group of 4+ is gonna be noisy.

The one time that happened to me, I got to the site about a half hour or so ahead of the big group, and did move onbecause they askedme forthe site-  which meant me setting up camp in the rain farther down the lake at an only half way decent site.  At that time, it didn't matter much and I was only slightly reluctant (I hadn't pitched my camp yet), but I wouldn't give up a nice windy point in heavy bug conditions - I've shared my sites a few times, too.

But I just don't buy into any theory that says a group of one or two is somehow less deserving of a nice site than a group of 4 or more.