NVIDIA was almost perfect on all operating systems. The open source Mesa implementation was surprisingly good, even without massive QA resources behind it, and bug reports received a friendly response. Intel HD Graphics on Windows, while not cutting-edge performance, was mostly bug-free. AMD's Linux and Windows drivers are OK, but ship with handful of major bugs. ARM/Mali was bad: only binary blobs with bad performance. Qualcomm/Adreno was a nightmare and PowerVR solution remains untested as it does not support ES 3.0.
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