This study aims to systematically compare the data quality of S-band weather radar and X-band phased array radar products and examine the suitability of X-band phased array radar for coordinated observation networks. Using the ground-based disdrometer and rain gauge data from a regional rainstorm event in Jinan from 18 to 20 June 2025, this study conducts a comprehensive comparison and evaluation of horizontal reflectivity (Z_H), differential reflectivity (Z_DR) and quantitative precipitation estimation. The results are as follows. (1) For Z_H, the S-band weather radar data exhibit the best attenuation resistance and stability, whereas the quality-controlled X-band phased array radar products show significantly reduced attenuation compared to raw data, and their stability approaches that of the S-band weather radar data. (2) For Z_DR the systematic biases in the original X-band phased array radar data are effectively corrected after quality control, resulting in data with higher reliability and better consistency than the S-band weather radar data. (3) For quantitative precipitation estimation, the quality-controlled X-band phased array radar products provide stronger precipitation detection ability and higher estimation accuracy, while the S-band weather radar retains an advantage in limiting false alarms.