Welcome, first off, what experience to you have with birds? Both of these birds are high maintenance especially for a beginner. Here is a list that you need to consider:
1. Your experience with birds
2. your living arrangements like do you live in a house, apartment, condo
3. Do you live alone or with others and if you live with others, how will they feel about getting a noisy needy pet
4. How much are you willing to spend, most places, these birds start at $1000.00 and up from there, that is just for the bird, cage, another $500-$1000.00, Toys a couple of hundred.
5. You will need a contengency fund set aside like $500.00 for those emergency vet visits.
6. How old are you, where do you see yourself, 5, 10 or even 20 years down the road. (both of the species you mention can live 50-80 years).
7. Are you willing to have a moody, screaming, squawking, sometimes nippy 2 year old attached to your hip for the rest of your natural life??
These are the questions that you need to ask and answer yourself, (not on here, but personally) before you make that final decision. Also, go onto You Tube and check out the videos on the particular species that your interested in. Also look for the videos of those birds being vocal, screaming and squawking and make sure to turn your speakers all the way up to get the full effect.
Yes, you could wind up getting a very nice quiet, well mannered bird. But the odds of that are against you. The chances of a noisy some time cranky bird are greater. Birds are like people in that they have bad days just like we do.
Good luck on your decision, I'm not trying to discourage you, just trying to give you the full picture. Now, if your good with all the negatives, then you will have a wonderful life and a loving companion for the rest of your life that will probably out last marriages, friendships and employment opportunities. You will probably leave them in your will. I have both of mine in my will.