Quadrotor controller comparisons commonly report a single tracking error, although the ranking also depends on tuning effort, reference information, actuator prediction, optimizer fallback, and command timing. We quantify these effects for cascade PID, hover LQR, boundary-layer sliding-mode control (BL-SMC), linear MPC with LQR fallback (LMPC-F), a preview-enabled LMPC-F, and a geometric $SO(3)$ controller on a common nonlinear plant with rotor gyroscopic coupling, motor lag, and saturation. A primary study (556 episodes at 50~Hz) combines matched twelve-candidate tuning, 400 paired evaluation episodes, and a 48-cell MPC factorial; a confirmation study (1462 episodes) repeats the evaluation on 50 fresh realizations with tuning budgets of 12, 24, and 48 candidates. A matched twelve-candidate tuning protocol changed the mean-RMSE ordering of the fixed baseline settings, mainly by moving BL-SMC from last to first. The ordering recurred on fresh realizations and did not change with 48 candidates, although BL-SMC's lead on the fresh set depends on a wider search range for its vertical switching gain. Reference preview reduced MPC tracking error and removed fallback activity on the figure-eight task. In single abrupt-step runs, completion depended jointly on fallback policy, predictor, and actuator authority. Command timing also changed the outcome: replaying measured command-call delays terminated three of four nominal MPC configurations on a desktop and all four on a Raspberry Pi~5, whereas capping the solver at 100 iterations removed every deadline miss in these profiles. We propose a reporting checklist that adds tuning effort, failure rates, fallback activity, applied-input variation, and command timing to tracking accuracy.

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