Admittedly, the range of capabilities of die sets is broader than the range of capabilities of UniPunch tooling. However, if the part can be made with UniPunch tooling, the list of advantages is long:
First is the speed with which one can acquire the tooling. Die sets are engineered for a specific part and then custom made in a die shop, a process that can take weeks. Modular UniPunch tooling is available off the shelf so even if a project needs some customization you can still be in production quickly.
Then comes cost. Die sets are purpose built one at a time for a specific part. The components of modular UniPunch tooling are made in larger, more efficient quantities.
When in your factory you use set ups of UniPunch tooling that are dedicated to specific parts, you can changeover at the press without having to adjust the press height. This is a time/cost advantage over using die sets for which the press height needs to be readjusted from part to part.
All tooling needs maintenance. For example, punches and dies require periodic sharpening. A die set needs to come off the press and out of production and go back to the tool room to be disassembled in order to perform even routine maintenance. With UniPunch tooling the punches and dies can easily be replaced on the shop floor next to the press between jobs, or even in the press and the disruption to production is minimal.
Sometimes a part requires an engineering change. Even relocating a hole might require obsoleting the previously used die set, perhaps before it had been fully amortized. At a minimum relocating a hole in a die set would have to be engineered and then the die set disassembled and re-machined in the tool room. With UniPunch tooling relocating a hole can be as easy as drilling a new location hole in the template. (To change a hole size can be as easy as changing a punch and die on the shop floor.)
Sometimes the part is made obsolete. In that case the respective die set is made obsolete, again, perhaps before the tooling is fully amortized in which case the unamortized amount is written off against profit. UniPunch tooling that had previously made a now obsolete part can be disassembled and reused on another part; it does not have to be written off as obsolete.
In summary, if the part can be made with UniPunch tooling, the tooling will cost less, be delivered more quickly, be easier to maintain, accommodate design changes more easily, and can be repurposed when the part for which it was has been used is no longer going to be made.