With an adult English Bulldog, what you see is what you get. The dog is often already house-trained, and its personality is already formed. The upfront cost is also lower than a puppy, because the spay or neuter, vaccines, and microchip are usually done. You skip the guesswork of how a puppy will turn out and can match the dog to your home.
An adult Bulldog usually arrives already spayed or neutered, which means desexed so it cannot breed. It is also vaccinated and microchipped, fitted with a tiny ID chip under the skin. So the upfront cost is lower than for a puppy, and the known temperament is a feature, not a compromise.
A senior Bulldog makes a gentle, devoted companion that asks for little more than short walks, a cool room, and your company. Older dogs do need more vet visits and may have arthritis or dental needs, so plan for that. Older dogs and special-needs seniors often make the most grateful companions of all, as senior-dog rescues will tell you.