Untill very recently, I strongly disbeleived that there r any real difference between bash and magic : that as long as u choose the right dragon colour, the result will be the same; and that, it is merely a matter of personal style. I, for myself, used only bash all the time.
Since the last 4 weeks or so, I have been experimenting a lot with this. My conclusion is that: there ARE significant difference!!
On more than 5-6 occasions, I have used only bash (or only magic), got defeated, healed it and used the same dragon except, this time, with only magic (or only bash). And I won!!
I also found that, dragons having yellow, purple and light magics r apparently stronger in magic than in bash. I, particularly want to mention the magic power of Air. I am not a big fan of using single colours, but try it next time and u will be amazed.
What confused me most is that there seem to be great variation inbetween dragons too. The bash power of my Landworm is simply devastating: only a handfull of dragons can stand against it. But the magic attack of Landworm is like a f*rt in the wind, never works. Devil's (same red/green as Landworm ) magic on the other hand r much more effektive than its bash.
We need to investigate more. Will be interesting to compare ur findings.