I personally like Spyro's better because they are faster and more effective. I like Cynder's too, but you have to keep pressing the button like for example her poisen. Her powers seem to run out quicker too. And I noticed that after a few seconds of using wind, it does not hurt the enemies. You get a few points out of them for about 5 seconds and after that it is a waste of breath.
Her fear doesn't always seem to work either. Her poisen you have to aim to hit your target. I do like her shadow though. That one is fun!
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So, I like Spyro's better.