>>14338886I think that Kaiji is FKMT's most accessible work, especially since it has two amazing anime seasons made my Madhouse.
That being said, I think here we mostly Akagipost, since it's a series that's based on Mahjong.
Ten is also about Mahjong, but it's one of FKMT's early works and it shows with the shifts in the artstyle and the narrative. It features some extremely clean, technical Mahjong, unlike Akagi which focuses more on absurd/extreme hands.
Also, Ten has possibly one of the best endings to a manga I've ever seen. 