I like anime, and I like mahjong anime. I love Akagi, Legendary Gambler Tetsuya, The Legend of Koizumi OVA. And I like Saki and it´s spinoff. I think the best is Akagi. But Saki, it´s true that it´s light mahjong, but because of that is more accesible. I think is the best portal to show what mahjong is to audiences that never heard of it. Because is a charming and colorful anime. The kind of anime to watch while away the time, when you have nothing to do. About Saki´s spinoff I think it has just a little of mahjong, so I think is worse than Saki. characters are less "catchy" to me.
If I have to show what mahjong is, using anime, I would use first Saki (if they like lighthearted anime), and then Akagi to hook people to play mahjong.
Life is as beautiful as you want it to be, but it´s only one. That´s why you must not get tired of it. Don´t care if you don´t say something that seems "important" because your mere existence is important for someone.