Kamen Rider W (2009)

OOO is the series after W so if you want to watch the Kamen Rider seasons in order watch OOO after W.

They're Kamen Rider series that has the primary Kamen Rider as a detective and involve them solving case that involves the antagonists. The main characters of each series are very well liked and brings a very cool or should I say hard-boiled feeling to them.

W is the series after Decade so if you want to watch the Kamen Rider seasons in order then watch W after Decade.

Build comes before the 20th Heisei anniversary

W comes after the 10th Heisei anniversary

both have dual colored riders

both have an ultimate form accessed by rider fusion