I got my Uro at the age of 12. And my Bearded Dragon I got when I was 14.

With only having had one Uro and one Bearded....I don't have much widely known experience.

However I find my bearded dragon with more of a friendly personality and more of a holdable behavior.

With the Uro he was holdable but not as "loving" as my bearded.....I actually no longer have my Uro. He was very squirmy in the beginning when I got him but he later calmed down a bit. As for interesting Uros are definitely cool.

But I hope everything works out and you find the right lizard for you and your brother.