Hi 
BD's grow very rapidly the first 6 months, I don't think a 10 gal would really last very long, esp. if you got a nice healthy 6-8" baby. You'd be better off with a 29 gal IMO.
As far as which is easier... Leos or BD's, the Leos don't require any additional heat/lighting, so they would be a little easier & cheaper. The BD you would have to set a timer for the lights or turn them on and off every day. Feeding would be similar. I've never had/been around a leo, so I'm not really sure what to say about them. We have a crested gecko and a BD. The BD is a lot of fun and I love watching for him to shed and see what new colors he'll be getting (he's only about 6 months old) and all of the kids love holding him. He's a pretty cool little lizard. I'd say if the size tank is important, go with the leo. If not, I love the personality of the BD plus you'll see him out tons more than a leo since they are diurnal.
Good luck with your choice!
-Bonnie
1.0 husband
1.3 2-legged kids
1.1 maltese/husky
1.0 tabby cat
1.0 pionus parrot
1.0 bearded dragon
0.0.1 crested gecko