From my experience +def is not necessarily better than +atk,
with +def indeed her weapon will be more effective but with +atk she will kill enemies more easily and even kill enemies in one phase/round when +def could not.
Stick with her fury if you don't have any rare skills.
And IMO if you are aiming for the safest spots in teir 20( like top 500) or even trying to stay in teir 20 then I really really don't recommend to use 4*merged units for you team arena core cause they score too little compared to 5*merged units.
BUT
For the mean time The 4*+9 Fae scores better than the 5* myrrh.
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