The seismic response of conventional friction pendulum isolators (FPS) can lead to resonance phenomenon due to their constant isolation frequency. Recent studies have explored the incorporation of passive adaptability to mitigate this issue. Two types of adaptive sliding isolators, Variable Curvature Friction Pendulum System (VCFPS) and Variable Friction Pendulum System (VFPS) from the variable-curvature and variable-friction isolator groups with passive adaptability, respectively, were numerically simulated and compared in this study. The study utilized a velocity-dependent coefficient of friction and modified viscoplasticity model to simulate the non-linear friction force of the isolators in a 2-DOF idealized shear building. The results show that VCFPS effectively controls transmitted acceleration to the superstructure and mitigates resonance in frequency response. On the other hand, VFPS is successful in reducing base displacement but does not perform well in controlling super-structural acceleration and mitigating resonance. Overall, VCFPS demonstrates better performance than VFPS

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