I've only had miniature, and both were crossed with another breed. The standard and decker are more hunt orientated, but the miniature can hold its own and is a great ratter. Rat terriers are playful, but less intense than other terriers. They have an off switch. They are very devoted to their people, and enjoy snuggling, and sleeping with their owners. Many other terrier breeds can be aloof.
They are a hardy long lived breed as they haven't been standardized for very long, and had an open registry up until 2018. Any dog that fit the description and standard could be registered as a rat terrier. Since the AKC let them in there has been some changes made that personally I don't like. Used to be a type A and type B, but now it's rat terrier and the Teddy Roosevelt Terrier. The Teddy is supposed to the the type B, but they are bigger boned and to me look more like jack russels. Thankfully some still stick to the original breeding and form of the rat terrier as an all around good farm dog, and pet.
https://ratterrierclubofamerica.org/about-the-rat-terrier