The hardest decision comes down to the exact length: Should I get a lob or a bob? The main difference between a bob and a lob is the length. “A lob or ‘long bob’ keeps the same overall silhouette but falls longer, usually between the shoulders and the collarbone.” For those who like a softer bob shape, he suggests extending the time between trims to about 8 to 12 weeks. A shorter bob can require a little more daily styling to keep it looking polished, whereas a lob often offers more flexibility.