Shikizakura

Purely the similarities end with the suits, both show will showcase a set of BATTLE ARMOUR that requires transformation. Other than that, the shows are completely different in story, I recommend it because I enjoy both shows enough, and I really enjoy cool ARMOUR designs, and with these two shows having that, I'll recommend this regardless, try it out, Gatchaman is pretty fun to watch. 

SSSS.Dynazenon and Shikizakura are both shows that try to evoke Tokusatsu genres (Kaiju and giant robots in Dynazenon; Sentai-style heroes in Shikizakura). Both shows are also ultimately stronger on the human element, with good quiet chemistry between their characters aside from the supernatural battling, despite having good action. Dynazenon is deeper and more emotional while Shikizakura is more light and fun, but their strengths are ultimately similar.