Book price is $6.99/TB for Wasabi vs $6/TB for Backblaze. Wasabi charges 90 days minimum for storage, and egress bandwidth is limited (honor system) to your total monthly data storage amount.
Wasabi also requires you to pay for a minimum of 1TB, whereas B2 charges per GB. That doesn't really matter for a company using a ton of storage, but it does for my personal use case of a few tens of GB.