Genki means something along the lines of 'healthy' or 'energetic' and the series of books under the Genki banner sure are enthusiastic  in dishing out lots of grammar at a high rate.

Pros:

• Very detailed explanation of the grammar.
• Added cultural notes help you understand the language better in relation to the culture.
• Listening exercises are made with students in mind.

Cons:

• Information per chapter can be overwhelming.
• Some valuable grammar sometimes end up in the vocabulary list.

Minna no Nihongo in Japanese comes down to 'Japanese for everyone' and this series is also the one that's being used at Leiden University.

Pros:

• Bite-sized chapters.
• Has extra books for reading exercises and grammar practice.

Cons:

• Listening exercises can be a bit too fast at times.
• Main textbook is Japanese only.

Marugoto has the association of 'entirely' or 'completely', meaning that these course books will take you through the Japanese language in a comprehensive manner. Many classes in group setting opt for marugoto.

Pros:

• Japanese based on ready-to-use practical situations.
• Simple grammar at a low pace per chapter. Ideal for those who also work full time.

Cons:

• Vocabulary, listening exercises, and grammar explanation all needs to be found on the internet. 
• Japanese more for practical situations rather than understanding the grammar behind them.