Favorite magazines
Afternoon (Eden, Genshiken, various stuff by Hitoshi Ashinano)
Big Comic Spirits (Bambino, various stuff by Junji Itou, Hideout, Punpun)
Comic Bunch (various stuff by Mizu Sahara)
Comic Ryu (A Centaur's Life, Monster Musume, Wandering Emanon)
Evening (All Rounder Meguru, Blood Alone, )
Fellows/harta (Gisèle Alain, Otoyomegatari, Ran and the Gray World, Swagamoto)
Gangan Joker (Akame ga Kiru, Prunus Girl, Yandere Kanojo)
Gessan (Hitoribocchi no Chikyuu Shinryaku, Mix, Tetsugaku Letra)
Morning (Hoozuki no Reitetsu, Space Bros, Tetsuwan Girl, Vagabond)
Weekly Shounen Jump (well duh)
Weekly Shounen Sunday (all of the Adachi manga alone would make this one of my favorite magazines ever but there were and are other good series as well like Silver Spoon or Yakitate Japan)
Weekly Shounen Magazine (my least favorite of the Big 3 weekly shounen mags, at least it has Baby Steps, Nanatsu no Taizai and Yamada)
Young Ace (Evangelion, Hoozuki-san Chi no Aneki, Inari, Konkon, Koi Iroha.)
Young Animal (Berserk, March Comes in Like a Lion)
Young King Ours (Arpeggio of Blue Steel, Bokura wa Minna Kawaisou, Lucifer and the Biscuit Hammer)
I'm not well versed enough in the hentai business but I like COMIC LO the best based on the covers alone.