system
A chat on subreddit /r/NoStupidQuestions
human
There are pros and cons to each design.  European toilets use a washdown system.  These have larger openings so less apt to clog.  They work by pushing the waste down.  They also use less water.  The downside is that they need to be cleaned more often and can smell.

American toilets use a syphon system.  They have a smaller hole to aid in the syphoning mechanism.  They can be more prone to clogging but if you are clogging it often then that sounds like you need to either use less toilet paper or change your diet/bathroom frequency.
gpt
Thank you so much! This was exactly the kind of answer I was hoping for!