The best pet is one that fits your lifestyle and your budget. A horse is going to be much more expensive and time-consuming than a cat or dog. A parrot is basically a lifetime commitment. Small animals require exotics vets and specialized care and "pet-proofing" of the house. So it's up to you.
A bunny :) you can get them at a farm trained to hop around your house and use a litter box or you can buy it at a pet store and have it sit in your room :). You can put a collar on it,walk it outside with a lease, buy a mini Fence for it to play around outside :) and their adorable ... You can find a lot of different pets on eBay classified pets it's an app and website
all animals(domestic not wild)can make a wonderful addition to a family/household.the best is shelter animals.adopt from your local rescue shelter.there are many whom will love a home and show it daily as long as you show the love and attention in return.do some research on different breeds and what the grooming,temperaments,etc are to see which 4 legged furry 1 would best fit in with your home.
chickens cause they are entertaining and you can sell the eggs so they are also a benefit. but they are not the easiest pet to take care of cause u have to clean the coop and collect he eggs every morn. u also have to watch out for raccoon hawks owls foxes ect.