  Hole spin qubits are frontrunner platforms for scalable quantum computers,
but state-of-the-art devices suffer from noise originating from the hyperfine
interactions with nuclear defects. We show that these interactions have a
highly tunable anisotropy that is controlled by device design and external
electric fields. This tunability enables sweet spots where the hyperfine noise
is suppressed by an order of magnitude and is comparable to isotopically
purified materials. We identify surprisingly simple designs where the qubits
are highly coherent and are largely unaffected by both charge and hyperfine
noise. We find that the large spin-orbit interaction typical of elongated
quantum dots not only speeds up qubit operations, but also dramatically
renormalizes the hyperfine noise, altering qualitatively the dynamics of driven
qubits and enhancing the fidelity of qubit gates. Our findings serve as
guidelines to design high performance qubits for scaling up quantum computers.
