With pyro, an alkaline fixer is advantageous. Acid fixers can reduce the level of stain.
I use TF-4 for both paper and film usually, but separate batches. Since I can buy TF-4 locally, there is no advantage to mixing my own (I've priced it out). If you have to have TF-4 shipped, however, it may be advantageous to mix your own or at least to use a fixer available as a dry powder. Fine Art Photo Supply sells an alkaline fixer available as a powder.
When I was using acid fixer, I liked Zonal Pro Rapid Fixer. It was fast and convenient. I still have some on hand, so I use it occasionally, when I don't need an alkaline fixer (like for film developed in Acufine or large batches of RC prints).