Unfortunately I don't think Verbatim manufactures any quad-layer discs, so Sony was the only real option for 128GB disks.
Furthermore, M-Disc is still very pricey per-GB, and their non M-Disc BD disks aren't priced that much better. I've also recently got a spindle of Verbatim BDXLs that every single one would fail to either write or read at the layer transitions, so having a single option here is already proving to be painful.
I finally made the move to setting up an account here and wean my reddit usage.
It's getting so bad on there, so many bots, trolls, and paid agitators. Plus the uptick in fascist apologists. Smaller communities with higher bars to entry produce better conversation, in my experience.