What is better to use as a Reference Book, A dictionary of basic Japanese grammar, or Imabi?

I've begun learning Japanese recently and I've decided to go down the Genki 1+2 into Tobira route for grammar, but I'm not sure what I should use as a resource for when I want to go more in depth with a specific topic, or for more clarification.

I'm having trouble gauging what resources cover what extent of grammar and to what level, and I'm looking for a resource I can go to any time I want to understand a topic of grammar at a very in depth level. For this purpose would the Dictionary of Japanese Grammar series be perfect, or would Imabi be better, or is there another resource that does what I need it to do better than either of them? There is so much advice about resources, but it feels impossible to actually narrow down the resources to stick with and rely on.