Board Thread:Dragon City Gameplay Questions & Answers/@comment-24932909-20140530105818/@comment-24964189-20140530141419

Pure and Pure Hybrids can't be critically hit, so are good as the "point man". I think in general category 5 dragons are better because they have higher survivability (higher HP). Ideally your 1st Pure/Hybrid will take out the opponent's 1st dragon and survive to meet the 2nd dragon. This allows you to see which of your remaining dragons is the most suitable one to meet the 2nd dragon when your 1st is defeated. So say your opponent has a Legendary as their 2nd - your Pure/Hybrid is defeated and you may bring in your Legendary to critically hit his Legendary. That (critical hit) is probably the only drawback of Legendaries compared to Pures, but Legendaries have a higher Legendary attack (2300) compared to the highest Pure attack (1500). To round off the complement maybe another Pure/Hybrid.

I'd say save your food for category 5 and 4 dragons - plenty of choice and variety. The 3/4 element dragons are good for type coverage.