First the important stuff! I first and often heard jonesing related to drugs, either jonesing or on a jones, meaning you were in the pangs of withdrawal. I think that is where it came from and then got to be slang for any unrequited desire. How it got into the drug culture I never learned. Things changed so much in that culture it was hard to keep up, especially from the outside looking in.
As to TLRs. As many here know, my take is that they are lots of fun to use. I first got a Yashica MAT 124G many years ago and loved that big negative. Within about a year it was stolen and I put a C330 on layaway but got a chance at a Mamiya Super Press 23 first and jumped for that.
Well, Wayne R. Scott is right. I sure fell for that 6x7 negative. I had noticed I was using mostly a 645 portion of the 6x6, but didn't dwell on it until I got the 6x7 and realized I could more easily use the whole negative. By the way, it is a rangefinder too! But all that meant to me was just another way to focus and a quieter camera.
I also now have a Rolleiflex and they are nice. I frankly don't use my MFs that much for some reason these days, but I never really did use the Rolleiflex much preferring the 6x7 negative. Also in the case of the Mamiya, it was a system camera with interchangable lenses and backs, bellows back, extention tubes, etc. I don't think you will ever hate a 6x6 and the two you are looking at I know the Yashica is fun. The Minolta always gets good reviews here also.
You might also want to look at MF folders. Many of them have superb lenses, some are RF, and all are easy to carry.
Now that I have muddied the waters for you, let me wish you good luck in your choice. 😀