FSD 14 lite, which is now available for the HW3 (~2019-2023) Teslas, is surprisingly good. I have a HW3 and HW4, and while HW3 isn't as confident and competent as HW4, it's good enough that I don't mind it anymore. My wife was planning on trading in the HW3 for a new Model Y next year, and now she might just wait a few more years.

I have a 2020 M3 on HW3 with v14 lite and it's very good. But even v12 was pretty good. I drove an HW4 as a loaner and did not notice a significant difference. I think the big difference would be on the long-tail of edge conditions, but I'm not sure.