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We compare two frequently discussed competing structures for a stable $\bar b\bar b u d$ tetraquark with quantum numbers $I(J^P) = 0(1^+)$ by considering ameson-meson as well as a diquark-antidiquark creation operator. We treat theheavy antiquarks as static with fixed positions and find diquark-antidiquarkdominance for $\bar b \bar b$ separations $r < 0.2 \, \text{fm}$, while for $r> 0.5 \, \text{fm}$ the system essentially corresponds to a pair of $B$ mesons.For the meson-meson to diquark-antidiquark ratio of the tetraquark we obtainaround $58\%/42\%$.

Comparing meson-meson and diquark-antidiquark creation operators for a $\bar b \bar b u d$ tetraquark