Hello, I'm sorry for my late reply. I missed this one in the reply feed, and as it was an older post I didn't keep track of it. Terribly sorry!
How is your planning going?
We went the Yoshida trail as we had decided to spend an extra night around the Kawaguchiko. I think also Yoshida is one of the best maintained trails. And one important thing for us as we slept on the mountain, the trail is facing east so we could wake up and see the sunrise along the trail.

I wouldn't really recommend to join a tour, even if you join a fast paced one you would never have the flexibility and decide the pace yourself.