I can only speak from my two experiences on the Buckingham McVie tour.
Early on I saw them in Detroit on 4th of July weekend. The venue was a beautiful theatre so the crowd was pretty tame and in their seats for the majority of the first half of the show. It had a much more buttoned-up feel to it because of the crowd and setting. You can hear it in the recordings/videos there are times where they are speaking between songs and you can hear a pin drop.
Then I saw them months later at a casino outside of Cleveland. That was a very relaxed show with, Lindsey really egged Christine on to tell the whole story of how she got back into the band. The crowd was much looser and it felt more like what you'd expect a rock concert to feel like. By far my favorite show of the two I saw.
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