I wanted to say thank you to everyone for your responses.
Dena - the ones we got were not really babies... but still young. About 4 weeks old, I think. (not sure when they're considered juveniles). But they seem very capable of doing what they need to and seem to have adapted without stress, so I hope we'll be okay.
We decided on the bearded dragon for a couple of reasons:
1) One of the biggest ones is that the leopard geckos seem to want to hide all day (noctural). Vs. the bearded dragons are very active during the day. Much more enjoyable for kids, IMO.
2) The second is, we visited a lot of pet stores and held quite a few of each. As a new lizard owner, I personally was attracted to the bearded dragons because they were very interested in ME. They had a lot of personality and were very willing (and seemingly very happy) to hang out on my hand, shoulder, etc... The leopard geckos we held all just wanted to squirm away and hide. Again, this made the beardeds seemed much more enjoyable for kids.
Don't know if this is a fair assessment of leopard geckos or not, but it's what drove our choice.
thanks again -