This really depends on the type of person you are and how much expirence you ahve with herps. also if you tell us how old you are that will help us decide as well.
Have you ever had a reptile before?
Do you have the room to house a 6 foot long lizard?
Do you have money to build a big cage for it?
Do you have money to feed it?
Do you have teh money to set it up properly?
Think about questions like that.. all that stuff adds up real quick...
Pros about iguanas are is they are great to have as pets i love mine.. he is one of my best pets i have ever had.. but i enjoyed my bearded dragons as well... iggs may be cheaper in the store but in the long run they are alot more money. my next cage for my igg is going to cost me anout 600 dollars to build.. and i think my bearded dragon cost me about 250-300. so thats quite a bit of savings and that was getting a cage that he could stay in for the rest of his life. with an igg you will go through a few cages so stuff adds up real qickly..
Sadly there are more cons about iguanas
They are big
Can have very nasty attitudes
Require alot of space
More expensive
Need more lighting
eat more
I could go on but you get the idea
Now with bearded dragons. they are smaller averaging about 18 inches in length.. some can get bigger.. some stay smaller.. which means a smaller cage. i had mine set up in a 75 gallon tank and he was very happy but you can use a smaller tank but the smallest i would go with is a 55 gallon. with bearded dragos they are all captive bred. so you are more apt to get a healthier one than if you buy an igg.. bearded dragons are very docile.. mine would sit on my shoulder for hours at a time while i watch television. but my igg will also sit on my lap.. my bearded dragon was very nice. you can get ones with lots of color... but with bearded dragon you ahve to feed live prey.. ie crikets and mealworms when small and mine always enjoyed a mouse or two a week.. and cricket expenses can add up real quick.. mine would eat a ton of them.. my male would easily eat about 50 in a sitting and my female would eat about 30-40 and tehy would both down a pinky or two after that.. but my igg eats alot to.. he eats about a bunch and a half oif greens a day.. some days more.
I could make a longer list but alot of your disision has to do with what you want. we cant tell you which one to get you have to decide for your self.. i suggest reading up on evrything you can find.. there is a great link at teh top of the page i think its called iguana info or something like that read through that.
Sorry for rambling on and on. i think i answered everything if you have any more questions just post them up.. or you can email me. i have alink to my email at teh bottom..
Mike D

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1.0.0 adopted iguana
0.0.2 Hedgehogs
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YOU DONT OWN YOUR IGUANA, YOUR IGUANA OWNS YOU