Why does Dill run to Atticus and not to Aunt Rachel when he runs away from home in To Kill a Mockingbird? Thank you very much.

Dill didn't exactly "run" to Atticus--he was actually
ratted out by Jem, who told his father to come into the bedroom where Dill was
hiding--but Dill knew that he was better off dealing with Atticus than with his Aunt
Rachel. He hid under Scout's bed because he wanted to be someplace where he felt loved
and safe, and Jem and Scout were his closest friends. Dill knew that Aunt Rachel would
call his parents, and he would probably be sent back to Meridian
immediately.

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Beneath its sweat-soaked dirt Dill's face went
white... Atticus was in the
doorway.

Scout reassured
Dill, telling him that Atticus wouldn't "bother" him and not to be scared. Atticus made
certain that the hungry Dill ate his fill before talking to Aunt Rachel, but Dill
"shivered like a rabbit" when he heard his aunt's "Do-oo Je-sus" echo in the hall. But
after enduring Rachel's scolding, Dill was allowed to spend the night in the Finch
house, and they shared a hug before Aunt Rachel returned home.