Which monster do you like the most in Heroes 5 at level 7?

They are all more or less good. One thing I can say for sure is that there is nothing worse than a ghost dragon. In general, the Titans are pleasing to the eye; after all, they are archers, and they have lightning when needed, and they are also good in melee combat.
And in second place, there is still the black dragon; magic immunity is more important than initiative.