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, good for couples but appear to be less suitable for a family with users 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.