So, perhaps the real difference isn't so much the browser as it is UBO?
(I Know that BB is basically Chromium with some changes, just like Chrome. And, that Chromium is not Chrome)
I don't mean this as a dig or anything but it's literally what they described.
Yes, which is not Firefox with default settings
For the average user there's not really a particularly good reason to jump for a downstream browser unless you are specifically using their main features (tor or VPN). It's easy enough to get 95% of the way there with 30 seconds of config tweaks off stock upstream.
The extreme bent towards privacy and not retaining any identifiable or fingerprint-able behaviors is exactly what its target audience wants, of course. But it leads to a markedly more inconvenient experience than Chrome or default Firefox or Safari.