Simultaneous Non-contrast Angiography and intraPlaque imaging (SNAP), a non-contrast enhanced MRA technique, shows great potentials for either static artery imaging or 4D time-resolved artery imaging. Arterial spin labeling (ASL) based imaging techniques can also be used for dynamic MRA, e.g., 4D time-resolved angiography non-contrast enhanced (4D-TRANCE). Both of them are compatible with parallel imaging thus practical for clinical usage. But they are based on different principles and their performance comparison is desired. This study aims to compare 4D-SNAP and 4D-TRANCE. Results show 4D-SNAP provides 4D dynamic MRA with higher SNR and fewer artifacts than 4D-TRANCE using either TFE or TFE-EPI.