Either species you mention will have this in common ( with all parrots):
They need at least 4 hours of out of cage time, every day, without fail. Fail and you wll have one pissed off parrot - you dont want that.
They need lots n lots of toys, which means things to chew and destroy, and those changed often, to prevent boredom.
THey are incredibly messy, pooping everywhere and plenty of it too, aside from being very messy eaters, flinging food across rooms onto walls and floors. Your landlord will not like this.
They bite. Even the most docile of parrots is going to bite once in awhile. Generally the bigger the parrot, the more damage they can potentially do, though some of the little conures can inflict a nasty one too. Annual mating season can mean your parrot looses their F...ing minds sometimes. My little Amazon does. Read up, a lot , on hormones on our forums here. Ekkies if I remember right, dont have a 'season' but are able to mate year round.
They live a LONG, LONG time, upto 50-60 years. Are you able to support and cherish a perpetual toddler with a can opener on its face for that long? Who has the above attributes? Think long term. Will you ever move? Will you ever have a signifficant other; some people do not get along with parrots and the life style that choice involves. Some parrots will intensely hate a new comer into your life, some may transfer their love to them and you could be the odd one out. That happens ALL THE TIME! Will you ever have children; babies, toddlers and young children and parrots rarely mix well. This section needs a lot of consideration by you.
They are very expensive, not only in purchase price. They can easily run you $100 or more per month for food and toys, and vet visits to an Avian Vet at least annually can run $3-400 or more, and care for a sick parrot can cost a lot more.
They are totally unlike domesticated fowl. They are WILD animals; most parrots are at most 1 or 2 generations from being in the wild. The only reason they can be kept in a domestic situation, in our homes is because they are so very very smart, but make no mistake. They are still a wild animal, a PREY animal, driven by instinct and self-preservation. Prey animals instinctually are fearful of lots of things, hide illness and injury until they are almost dead (the sick/hurt ones get eaten first), prefer to be in flocks of similar animals, and all sorts of other instinctual behavior.
They do not mix well with cats and dogs in the same house. Aside from cats having a bacteria that is deadly to them, both are predators and even if the parrot is caged while they are around, most parrots will be extra nervous and jumpy/ fearful when they are around. Do not take cutesy pie Youtube videos as the rule!! The only reason I have a dog is because she is an ancient, old terrier, who is deathly afraid of my Amazon, and runs (well, more like totters out) from the room when he is out. My last dog, a Jack Russels, would have continually be trying to eat any parrot. Death by domesticated cat/dog only takes a split second, literally - we see this all the time on here in our bereavement forum.
THey develop intense bonds with their favorite person, and, having the full range of emotions very similar to us, they can get jealous, angry or sad or even morose, when something happens that disrupts that bond and relationship. Long absences ( over even short ones), like vacations, business trips, medical absences and others can drive a parrot to extremes of these emotions, including biting more, or even self destruction ( look up feather plucking and its extremes). Ekkie in particular are know for developing feather plucking habbits.
Having said all this, for those of us willing to accept all these points, and alter our lives to accommodate them, parrots are the most rewarding animal companions we could ever hope for. The list of plus's they can bring to a home far, far outweigh the above perceived negatives.
