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If Allegro was to compare apples to apples all the core- and coreless-based solutions for high currents above 100A, the designer would see that the core-based have the best performance even though the core hysteresis is still to be taken into account. However, they are quite big and expensive. The single ended coreless with a shield allows a much better crosstalk immunity (and to some degree the stray fields in comparison with other coreless methods), but at the expense of a very slow response time due to a low bandwidth. It is slightly more expensive and takes up some space. The single ended coreless is one of the cheapest and smallest ways to achieve the field sensing, but it leaves the IC subject to a lot of noise from the crosstalk or the stray fields. The Differential mode coreless field sensor in a busbar hole would have better stray field rejection, and a slightly better bandwidth and resolution. However, the best way to install a field sensor is with a differential coreless on top of a busbar notch. It allows much better bandwidth (up to 20kHz) and great stray field rejection as well as a better crosstalk immunity without hysteresis this time (in comparison with the shielded version). But it can be tricky to install because of the high placement tolerance. It needs to be very close to the busbar.
