What to get a Manchester Terrier or a Siamese Cat?

One family member wants a dog, another wants a cat. Its down to either a Manchester Terrier or a Siamese Cat. Which to go with. Half the family wants a dog, Half wants a cat. 2 members hate cats, everyone loves dogs.This is kind of a hypothetical, this is my brothers family.They can only have 11 member is allergic to cats, but thats the member that wants the cat the most. A child ofcourse

GET TEH CAT CATDS ARE THE BEST A NIMALS THET ARE GODS CHOSE COMPANIONS

Terrier. You don't want to isolate the child who's allergic to cats from the family pet. That wouldn't be fair.