Honestly, Tana can be used in so many different builds that it really comes down to what kind of unit you're looking for. Vidofnir gives her an effective 32 defence, so you could run +Spd -Res and use her as a fast, tanky flier. On the other hand, you could try +Spd -Def, rely on Vidofnir to make up for the bane and go for an offensive set with skills like Death Blow and Desperation/Vantage.
Maybe this isn't the response you were hoping for, but it just comes down to preference. +Spd is her best boon stat no matter what build you're planning to use, so take a look at what units you have and decide whether you need a more offensive or defensive flier.
We should have some builds coming out soon, so keep an eye out on her unit page.
-L
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