48gb macmini m4 pro or 64gb M1 max studio

I have the opportunity to change my existing m4 pro to the older M1 max. I think without topping up extra. Is it worth it?

Seller has yet to tell me if it's the 24 or 32 core variant.
I think I will be able to run the 27b with larger context. What are my pros and cons? Slower older machine?

Thanks!