I finally got around to comparing some different chargers and cables with my new USB power meter. Some of the results are a bit strange. I ran through all the testing twice to make sure it was correct. Testing was done while running Plants vs. Zombies 2, to place a significant load on the tablet.
OEM Nexus 10 Samsung Charger
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Cable: Voltage, Amperage
Generic: 5.31v, 1.45a
LG Nexus5: 5.32v, 1.46a
OEM Samsung: 5.31v, 1.45a
POGO: 5.40v, 1.81a (no surprise here)
Generic 1.5A Charger
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Cable: Voltage, Amperage
Generic: 4.96v, 0.79a (strange)
LG Nexus5: 4.98v, 1.33a
OEM Samsung: 4.96v, 0.78a (this is even stranger)
POGO: 5.02v, 1.53a