Could depend on a couple things.
Back dating to a earlier 'Stang PCM will add bank fire injectors and back to a single ignition coil with a distributor, both of which will cost some efficiency and performance.
Arguably, the better option would be a tuned '97 Explorer PCM with the transmission functions shut down.
Keeps the sequential fuel injection and the superior coil pack ignition.
Down side is the $200 - $400 for the privilege.
Again, arguably, the best option would be to move to "up date" the PCM to a tuned 99 - 01 Expo with both the PATS and transmission tuned out of it.
Would need a much higher fuel supply than the other options and different injectors but the higher fuel pressure to the injectors aids in fuel atomization for a few extra bits of power and efficiency.
Between the differences in the cam position sensor wiring and different fuel system, the last of the Expo PCM's would add even more cost and effort than the earlier Expo PCM.
So, it's a balance of cost vs function.
The "Stang PCM will absolutely do the job for likely the least cost. A tuned Expo will likely do a better job, but for more work and cost.
No right answer, no wrong answer, just whatever best fits your wants/budget/desires.