If you are unsure regarding which Mac, simply allow the Mac to choose! They are much better at it than we are and regarding development of a Relationship Bond, there is nothing better than having the Mac already liking you!
At this time, it is legal to travel within one's own Country without a vast amount of Documentation. But, I expect that too slowly change over the years to come. Health based Documentation and Ownership Documentation is already required if you travel by Aircraft and not all carriers will allow 'Pets' in the Main Cabin.
Travel within North America is as restricted as traveling across Oceans. That is to say, traveling from the United States to Canada and back required extensive Documentation for ownership and health, plus the entrance requirements of the Country that you are traveling to and/or returning too. This would be the same as Traveling to Northern Europe. And, as noted above, each Country has their own additional requirements.
One of the realities is that if you plan to travel internationally, you will need to be working with a Certified Avian Vet (CAV) that will developed the Health documents specific to the Country that you are traveling to. If you do not return within a preset limited time, you will need a CAV in the Country you are returning from to develop like documents for your return to the United States.
Ownership Documentation:
Leg Bands had been a means of Identification many years ago for Parrots that had been Imported in to one's Country with certified that this Parrot meet the entrance requires. When the Import of Parrots was Stopped, so did the use of Leg Bands for entrance requirements. Today, Leg Bands are used by and every smaller number of breeders as an identification within they flock.
Regarding All Amazons and several species of Macs, young birds require a 'Birth (hatch) Certificate' defining the parents, the breeder, the date of birth and specific contact information of the breeder. And, any-point of ownership change, the information of the past owner and new owner are required to be added to this document! This is an International Requirement and if you are traveling with a young Parrot, you need to assure you have it if you species of Parrot is Controlled by CITES.
The only assured and fully accepted "Legal" means of Ownership Identification in mid to larger Parrots is the Microchip! If you are Traveling with your mid to larger Parrot you should have it Microchipped! If you are Traveling with a young CITES species, you must have it Microchipped to properly prove ownership.
The North America is at this moment very sloppy regarding CITES requirements, but I assure you that Western Europe is not!