First off, welcome to the forum! As for which one would be a better choice... I have both bumblebee walking toad and fire-bellied toad. And I find both are just wonderful.
Quite frankly, if it is to share frog moments with your daughter, the fire-bellied toads might be the better choice. They are bold, very active during daytime, and their bright colors make them really stand-out. You should know though that they do secrete toxins and you have to be careful if you touch them, and when you change their water (they need an enclosure that is 2/3 water and 1/3 land). The toxin is enough to give you stomach ache.
Here's a link to the FBT's care sheet: http://www.frogforum.net/toad-care-a...relatives.html
As for bumblebee toads, they are less active, although diurnal, but they are not shy. They are far from being as bold and active as the FBT. Their striking colors and small size make them a wonderful frog to own. These toads will eat small insects such as pinhead crickets and fruit flies. That should be taken in consideration (I often suggest that if you decide to feed fruit flies to your frogs, you should culture them - unless you have a place that sells them close to you). In the wild, the BBWT also secrete poisonous toxins, but lose their toxicity in captivity.
Here's a link to the Bumblebee Walking Toad's care sheet: http://www.frogforum.net/toad-care-a...-breeding.html
If you have any question about either, please don't hesitate. I love them both. I am though very fond of my bumblebee toad.
Eric