My thought is that right now you should consider getting neither. That you are in a place of “dog OR cat” is a pretty good indication you are not prepared for either. Both critters are very much different in their care needs, very much different in the way they will fit into your life style.
My life style is better suited to dogs. I feel it is irresponsible for anyone to own a dog that is not taken thru FULL dog training when old enough. I know they are cute as puppies but they grow up. And yes, they are fine around people, but they are not people, every dog is an animal with a ‘dominate or be dominated’ temperament. Dog training starts the day you bring the critter home as a puppy. And if done correctly, there is absolutely zero possibility a dog can harm anything in your home, at any time. On the other hand, if you don’t do proper training, a dog can see everything in its environment as a potential chew toy, at any time.
Too often people get a dog for the way it looks. That’s the wrong way to do it. You should start by researching the physical attributes (size) to see if it fits into your life style. Then consider the temperament, intelligence, and maintenance of the various breeds to see which of those attribute fits your life style. Some dogs (Jack Russell terrier, poodles, PWDs) don’t shed, don’t have dander, are pretty much hypo-allergenic. Cats are not. Will you have people visiting that have pet allergies? Other dog breeds shed so much whenever they get up they leave hairballs behind. Mutts can be great dogs but they bring their own special considerations with them. These are the things to consider with a dog. How does all of that fit into your life style? How does it compare with being responsible for a cat? That’s why I suggested you may not be ready for either a dog or a cat. You still have some more researching to do, but for what you wanted to know, pet+spkrs is not a problem if the pet is a dog with proper care.