Routes from Minakami to Tokyo?

#1
I'll be riding from Minakami home to Adachi-ku this coming Monday, and instead of just bombing downhill all the way to Maebashi and grabbing the Tonegawa to Edogawa home, I thought it might be interesting to do a little climbing first.

It looks like the two main options are going west (251 to Akagiyama or 62 to Kuryusan), which both seem like they could be pretty hardcore and long climbing, or east to 36 to Mt. Komochi, which would be shorter.

Would love to hear from anyone that has experience/advice with any of those routes. Cheers!