The difference is The Living Daylights is far more exciting and better paced than Quantom. In both films Bond goes borderline Rogue from MI6 due to a loss of a loved one. But I did remember how much it shares with The Living Daylights of 20 years prior. I found it crazy how much I didn't remember about this film. But I think the film gets a worse rap than it should because it's in between Casino Royale and Skyfall. By no means is this a great film, in fact, it's surprisingly uneventful.
This time Bond is out for revenge against the people who killed his one love, Vesper. In between two of the greatest Bond films of all time, Quantom of Solace returns back to the fomula of several Bond films except for the fact that the story line pretty much carries over from Casino Royale.