Film or digital negatives... no one can answer that for you, it's a personal choice. One can make nice prints either way.
Personally, for the last dozen or more years, I have used digital negatives exclusively. For me, there are three advantages. First, one can dodge and burn when making the negative. Second, one can print a digital negative at different sizes. This allows one to fine tune things by making small prints and then print a larger negative for a final print. This saves on costly materials and really helps with the learning curve. Lastly, one can easily print the same image using different processes just by printing another negative with a different curve applied.
Lastly, you don't need Piezography to make digital negatives, I have seen lots of great prints made with negatives using Epson OEM inks, probably some with Canon inks as well, but most folks use Epson pigment ink. Currently, I print negatives with OEM inks on a P800. I used a 3880 before that. I also run a 3880 with Piezography Pro inks, but I have never seen the need to use it for printing negatives. (My digital negative process predates my Piezography system by many years, so the inertia to change is large.)
All of the prints in the alt process sections of my website (
www.frg-photo.com) were made with digital digital negatives.
Regards,