I think its an impossible question as it varies with what you want in your life, also pets are not robots...you may say I want a cat because xxx and the cat you get has no interest in xxx at all
I am always dubious too about the "Get a dog, it will get you out for exercise" myth. Its likely that there will be periods in its life when it can't/won't want to go out and exercise, or the exercise will be limited and as it gets to old age, these periods are likely to get longer and more frequent. Noba, it may well be less capable of being left alone/travelling by car and therefore for a time it will also affect your ability to go out. If you want something to give you exercise get a Peloton subscription!