While everything is relative, I do think that introductory anatomy/physiology courses go way more in depth with the urinary system than they do with reproductive.

With the reproductive system, there are the various phases / cycles to memorize + the associated hormones.

With the urinary system, there are the hormones, how it affects blood pressure/volume, each section of the nephron, how the hormones affect the transfer of each molecule at each section of the nephron... and that's just the stuff I remember off the top of my head