Which level 7 creature is the best, and why?

Ungraded Titans are useless creatures, but when upgraded, they are the strongest and deal additional damage to black dragons!
Archers are only useful because they resurrect, but otherwise, no, it's just that if a large army is against you, you can use tactics, kill the strongest one, then another one hits you, you respond, and then there's nothing... But, for example, dragons can take out several enemies with their fiery breath, and Hawks also have a bonus against Devils.
I don't know about you, but in my ranking, the worst are Phoenixes (both types) and Devils (both types), and Skeleton-Dragons (both types).