In practice I think access to BBS systems came before Usenet for many of us. I didn't have Usenet access until I had internet access (through a BBS). And I didn't have a good nntp server until I had a dedicated ISP many years after accessing dialup, non-internet BBS systems.
I remember reporting a PINE newsgroup thread bug at the height of my nntp usage and several of the local BBS systems had started dying off by then.