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OLED C1 series is a more advanced OLED than the A1. The differences between the A1 and C1 are greater output power, additional USB port, the latest HDMI, version 2.1 (4K@120Hz) and a faster processor. You can see the link for a side by side comparison of the two models, https://www.lg.com/us/compare?bizType=B2C. ^Daphane
Sorry, there was a problem. Please try again later.The main difference is the refresh rate. The A1PUA has a 60Hz refresh rate and the C1PUB is 120Hz. Unless you are using it as a gamer monitor you likely won't see any difference. If you are going to use it for gaming consider the C1PUB. At the 55" size it's about $300 more than the A1PUA. I have the OLED55A1PUA shown below and I love it, no issues, I don't use it as a gaming monitor though.
I would recommend:
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