So far the determinists are winning the argument.
Well the argument is a forgone conclusion for an actual determinist. There's no winning anything without agency.
"Decisions" are made for reasons. At any moment you entirely inherit those reasons. You cant go back and re-write different reasons for yourself that would compel a different outcome.
You'd think that....right?
Hume made a rather solid argument against logical induction. Essentially you cannot logically say the sun will rise again tomorrow just because of pre-existing evidence....because there's no way of knowing of any epistemically material consistency to reality over time.
I think the "split brain experments" show rather convincingly determinism is a result of some folks thinking too hard about the causal nature of reality and too little about the limits of their own perceptions.
Basically, before medications were able to successfully treat grand mal seizures...one possible fix was a risky medical surgery where the brain's two halves were split...preventing the seizures from spreading. This led to some interesting experiments....as scientists already knew one half was visually oriented...and the other linguistically oriented.
Screens were set up...with each eye seeing a separate screen. A picture of a hammer on one screen...a picture of a ladder on the other. When asked what they saw, they would say the word for the visual...but when asked to draw it they would draw the other picture.
The interesting part is when confronted with the contradiction....asking why they drew the hammer if they saw a ladder....they simply invented a reason. It wasn't true of course, but they didn't believe they lied.
Point being, everyone's brain will simply invent causes where they cannot be found. It's a limitation of perception.
Now, the deterministic can still say that despite the brain inventing causes....a cause must exist for this. I would then refer them to Hume...and point out there's nothing inherently logical about that belief. It simply seems that way due to our limitations of perception. Causal reality could be nothing more than the organization of experience and perception in the mind.
Unless..... there some other influence at play that operates outside this causal chain. Thats what I believe. But its a belief waiting for demonstrable evidence. And so my belief doesnt win the debate.
If your brain invents causes that don't exist, and it does, it's unclear how you could ever hope to know you're correct.