You need to select it based on two factors- 1. If you want to keep the freezer separate for easy handling, or, 2. The number of users. The single-door refrigerators are best for bachelors, and good for couples but appear to be less suitable for a family with users of more than two. For a group of 4+ people, a bigger refrigerator can be suitable. A double-door refrigerator is good for 4-5 members though it depends on the food habit.