Young Tiki IVs

For a while now I've had a +Atk - Def Young Tiki in my barracks, but today I pulled a +Spd - Atk one. She doesn't have any skills worth foddering, so I'll just merge one into the other. My question is, which IV set is better?

If it makes a difference, I don't plan on using her in arena. If anything, she'll probably just be an extra dragon counter for AA.