Grand canonical Monte Carlo simulations were used to calculate hydrogen adsorption in IRMOF-16, NU-100, and UiO-68 functionalized with Mg or Fe catecholates on the linkers. We examined how altering the number of metal catecholate groups affects H₂ uptake and deliverable capacity near ambient temperature. We find that large free volume and an isosteric heat of adsorption (Q_st) of 20kJmol⁻¹ at low loading will maximize gravimetric deliverable capacity while a small pore diameter will maximize volumetric deliverable capacity. This suggests a trade-off between the properties that lead to maximal gravimetric and volumetric capacities. For example, our calculations suggest that NU-100 functionalized with six Fe catecholate groups per linker takes up 5.5wt.% deliverable H₂ at 243K and 100bar, but only 24.2gL⁻¹ deliverable H₂.