Both are about the growth of both teachers and students and how they grow, learn, and have fun separately and together
In both "Ataru" and "Algernon Ni Hanataba O" there is a 'disability' similarity that I think other viewers may find interesting. Also, the main actors/characters in each drama are not only actors they are also both in the 'idol' industry; singing, dancing, concerts, acting, etc...
"Kohiya No Hitobito" and "Mayonaka no Panya-san" are made for different marketing audiences, however, they both give off the same air and are roughly in the same genre. Each show has a wonderful cast and both have a very unique story to tell!