It depends how you're going to access your data/ compliance needs.
B2 per/TB storage is much cheaper than what R2 will be.
R2 will enable cross-region availability which can be necessary for many companies choosing to adopt.
It's my opinion that R2 targets more the likes of S3/ integrated storage providers rather than just being a "low cost" provider like Wasabi/Storj/B2/etc.
Wait. What’s the other segment?