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These nations all developed torpedo fire control computers for calculating torpedo courses to intercept targets, but the TDC added the ability to automatically track the target. The target tracking capabilities of the TDC were unique for submarines during WWII and set the standard for submarine torpedo fire control at that time.
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That's exactly the reason it was superior. All WW2 TDCs were basically angle solvers, i.e. analog "automated" slide rulers, and as such their output was only as good as their input (Your estimates of range, distance, etc.). But the position keeper was different. It made a "prediction" or "simulation" of the targets movements after your inputs, using the speed, course and all data you gave the TDC. This was useful for two reasons:
1.- Being able to fire with no visual reference -i.e. not raising scope necessary- and also staying aware of tactical situation.
2.- Being able to CHECK wether the target actually behaves as it was expected. If the target is really where the TDC predicts it shall be, then you have a really good firing solution.