Both of those rabbits are gorgeous. They are also both very rare, unfortunately. It depends on what breeders are in your area. I know we have more Thrianta breeders than NZ Red breeders here, because I see more Thriantas at shows than NZ Reds. There is a member on the forum who breeds NZ Reds in Pennsylvania, I think, so you might want to post in the Rabbitry section looking for a local NZ Red breeder. She might know someone local to you.
You can also post in the Regional section of the forum looking for either breeder, or go to
www.arba.org and look for breeders near you. Another option that is less likely but preferred is to check local shelters and rescues at
www.petfinder.org . It is not common for these bunnies to show up in a rescue, but it does happen, and you never know, you may see a picture of a bunny online that steals your heart. If you want a pet rather than a show bunny, getting one from a shelter saves a lot of money because they usually are already spayed or neutered, which is really recommended for pet bunnies for health and behavioral concerns, and that is a very expensive surgery.
I know the NZs will be a lot bigger than the Thriantas and will have a different body shape. They are more in the 10-12 lb range, whereas the Thriantas I think top out around 6-8lb. A bigger bunny will usually be calmer and more docile, but less happy about being picked up, and more prone to some health issues. Larger bunnies have shorter lifespans by a couple of years due to the strain on their hearts.
Other than that, there aren't many broad generalities you can make about personality traits in rabbits based on breed. They are not like dogs in that certain behaviors are selected for in breeding. The rabbit's personality will be something you can only determine by meeting them. I would start by looking at local shelters and breeders, and go from there. Most breeders will not ship bunnies a large distance due to stress on the animals.