In both anime series the MC are sent back in history in order to protect something . The only difference is that in drifters there are many other creatures like Elfs , dwarfs and others. In Katsugeki/Touken Ranbu the MC are animated swords that must protect the history and in Drifters they are warrios from different eras of Toyohisa's world who were thought to be dead.
Although Katsugeki/Touken Ranbu is a Japanese anime unlike Mo Dao Zu Shi being Chinese, they both have a similar artstyle (with MDZS definitely being superior with its beautiful art while still keeping the resemblance), both stories happen in the past, talk about Samurais, show off mysterious creatures filled with negative energy and people fighting against them. The characters are also pretty comparable at some points, most of them being long-haired man wearing Chinese-ish clothing, yielding their swords and fighting evil. In my opinion these two anime series give off a very similar vibe, both the story and the overall look.
Do you like historical/battle action shows with AWESOME sword fights?
The main difference between the shows is that the world in Token Ranbu definitely has a touch of fantasy whereas Rurouni Kenshin has a realistic setting but if you like well choreographed fights and shows set in historical japan than give these series a try.
Swords, boys, light beams, intense action choreography, Japanese history, and both are based on games... these two shows are surprisingly similar.
Sengoku Basara has a brighter palette and a more positive feel, whereas Katsugeki is much darker. Outstanding action in both shows, Katsugeki being the more polished of the two with very good utilisation of CG.
Neither are exactly shows to watch for plot or character depth, but if you're a fan of the games or are looking for some fast paced shiny action fuelled by shouting, give Basara or Katsugeki a try.
Both have elements of the Shinsengumi, But Touken Ranbu is about historical swords transformed into men to protect history. The swords from the shinsengumi include Izuminokami Kanesada(uchigatana) and Horikawa Kunihiro(wakizashi) wielded by Hijikata Toshizou
Its an alternative setting like MAL say. Katsugeki is more serious, more angsty and has a better animation in my opinion (I love hanamaru too don't kill me saniwas) but both are worth watching if you love Touken Ranbu.