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Highest I've seen is 7x on a brand new untouched disc. The 14x vs 16x doesn't matter here. Just if the firmware allows for UHD and avoid lockouts.The WH16NS40 is a 16x drive (vs 14x for the other) and is more reliable when it comes to multi-layer Blu-rays (hence UHD support after some hackery).
16x is good for a theoretical read/write speed of 72MB/s versus 63MB/s for 14x.
For real world speeds, I recall seeing mid 20s to low 30s when backing up a normal Blu-ray movie in MakeMKV.