I had to check to see whether John the Ripper is still maintained. As a matter of fact, 1.9.0 was released last year, four years after 1.8.0:

https://www.openwall.com/lists/announce/2019/05/14/1

The release notes mention that CUDA support was dropped, but that 88 formats out of 407 have OpenCL support.

A few formats also have support for the ZTEX 1.15y, a now-discontinued FPGA-based board popular for crypto mining, which is something I don't think Hashcat has. Here's an article I found on that topic:

https://medium.com/@ScatteredSecrets/bcrypt-password-crackin...

Edit: the two HN submissions for JtR 1.9.0 got no comments, but this Slashdot post does have some comments from a maintainer:

https://it.slashdot.org/story/19/05/18/1841245/new-john-the-...

Hashcat has far better performance, unsure if jtr supports ‘rules’ (eg add ‘1!’ Suffix to each word - bashcat has many rules like this).

Hashcat is a pita for quick jobs so JTR is better if you’re teaching a class of unequipped students.

I’ve never had hashcat work out of the box at all, either driver issues or it exits because it overheats my GFX. When it is running it is very, very good though.

I’ve used johntheripper for wordlists and hashcat for brute-forcing, but the ethos might have changed.

Hashcat has massively better scalability and support for GPU acceleration