Claire doesnt use either. She just wasnt interested in a dummy and would scream as soon as a dummy came anywhere near her. She wouldnt have a bar of it at all. She only sucked her thumb for about two months, and hasnt sucked it at all for about 6 months. I remember MIL was insisting that I just keep on shoving a dummy in Claires mouth, but I just said "yeah" and let it go in one ear and out the other. She was saying "you HAVE to make her take a dummy". Claire never really relied much on her thumb for settling anyway so I never bothered with forcing a dummy into her as it just didnt seem necessary. I'm all for letting bub decide.

Anyways, after my rant there, I can see good things about both. Mainly being that you can take away a dummy when it is no longer age appropriate, but thumb stays there forever. I've seen kids who are 6 and 7 still with dummies for bed time though, so I suppose its probably difficult to take it away from those kids who really love it. But I feel that a thumb may be more natural and bub will always know where to find it, iykwim.