Like others have stated, I would also recommend sticking with the CR-1. It's ultimately your choice, but I would suggest looking at what others have done in your situation.
I have been following your posts and see you are trying very hard to learn all about this. We all are. There is so much information, and at times, it is overwhelming.
Not to be harsh at all, but it appears you are doing the bulk of the research and posting. I would suggest having your husband read these forums in and out, as there is a great amount of help here. For the most part, people here know much more than the CSRs you will speak to if you try and call USCIS. They are trained to know their limited part, while people here are going through the whole process, from beginning to end.
The reason I suggest you have your husband do this research with you, is I know this must be difficult as a non native English speaker, as it is tough even for us with English as our first. I also say this because you are not the one who is sending the I-130 in, but your husband. He is the one to petition for you, so he should be asking all of these questions and getting everything prepared.
Good luck with whichever visa you choose to apply for. There are a few of us Americans on this board who have Japanese wives, so our situations relate to yours, so please feel free to ask us anything, as we are going through the same thing you are.