There's no answer for this because everyone who adopts a dog should always consider what their needs are and what dog will fit their lifestyle rather than "ooh let's just get a ______."
For example, an active couple who is looking for a small breed dog (say, they live in an apartment and can't have a dog over 20 many pounds). This couple might not do well with a pug, which is a breed known to be a couch potato. Instead, they might do better with a high energy breed that loves going for walks or going out with the couple and doing hiking or other activities. For that particular couple, a Parson Russell Terrier might be a good choice because it is a high energy, small dog that meets their life requirements.
You really can't just pick a dog based off the dog breed, you have to pick a dog that is going to fit your needs. My husband and I have a sheltie and we take her everywhere: morning 2 mile runs, hikes along the Lake Michigan beach, boating, she even comes with me on Friday and herds cats (and plays with them) at the shelter I volunteer at. She fits our lifestyle (we don't have kids yet), and we chose her knowing that her breed is a higher energy breed who wants to go out and do things and not just sit inside on the couch all day.