Both titles are OVAs from the 1990's that was released by Manga Entertainment. They are very similar in tone and content. Angel from Angel Cop and John "Sleepy, Mad Bull" Estes from Mad Bull 34 kills criminals with ultra-violence and believes in just getting the job accomplished. Both anime are action-packed anime filled with violence, blood, and gore. Both anime are very over the top and have pretty good entertainment values. If you like one, you will enjoy the other.
Both titles where release around the same period (early-mid 1990's) with similar animation and a similar vibe. Both anime deal with police cops fighting against high level of crime across the city. The police cops in both anime kill criminals in the most gruesome ways. Both of these anime are over the top and are both filled with violence, blood and gore. If you like one, you will enjoy the other.
Both Duke Togo and John "Sleepy, Mad Bull" Estes are very big, muscular and are popular with the ladies. They are both not afraid of anything and will get the job done. Both anime are very similar in tone and content. These two old school anime titles are action-packed anime with violence, blood, gore, sex and gratuitous nudity. However Mad Bull 34 is more over the top and can be silly at times while Golgo 13: The Professional has a more serious driven plot. If you like one, you should enjoy the other.
Both anime are old school OVAs from the same time period (late 1980's-early 1990's). Both anime are set in the United States. They are both very cheesy and over the top with a bad ass main character. However Riding Bean has way less violence, gore, and nudity compare to Mad Bull 34. If you like one, you should like the other.
Both have cops, obviously. While Inferno Cop was made as intentionally over the top and crazy, Mad Bull actually tries to take itself seriously. Imagine a show written by Japanese who have only ever experienced New York through American cop dramas. Look forward to power suits, sex, and the infamous grenade crotch. Watch the dub for the full experience, as British VAs don their best "New Yoik" accents. One of the best bad anime ever made.
Inferno cop should be experienced by everyone, regardless of whether or not Mad Bull made you laugh your ass off. If you haven't done it yet, watch it!