A quiz is the most fun way to find out. Make one in seconds, send the link, and let the bragging rights begin.
Under the heading Who knows the most? on the front page: making a quiz and sending its link to see who knows most. "Let the bragging rights begin" is playful: the fight for the honour of winning starts, so use the language's own idiom for it
Khwizi i ndlela yo tsakisa ngopfu yo swi kuma. Endla yin'wana hi tisekoni, rhumela linki, kutani a hi vone loyi a nga ta tinyungubyisa!