I don't know about the others, but for us, the FP machines in the WDW parks worked much better than the Universal UEs, although we needed the latter only in US proper and not in IoA.
The FP machines are well located, easily spotted and almost always work correctly the first time. But the UE machines are poorly located, often hard to spot (especially in IoA, although we did not need to use them) and often do not work, needing the assistance of a park steward. The 'swipe' system is annoyingly tempermental and trying to scan the bar code does not always work either. Several people had problems at one at MiB one (among others) and even the first staff member could not solve the problem; in the end, they had to call an engineer, who said privately later that they were a nuisance.
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