From the "Similar Efforts" section toward the bottom:

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David Ramiro built his m2p-latency and compared X11 vs Wayland in his article Building an Input Latency Meter (Because ‘Wayland Feels Off’ Isn’t a Metric) as well, coming to similar conclusions:

Native Wayland is on par with native X11 (all tied at ~7 ms), while XWayland roughly doubled the latency in his tests.

farnoy did extensive testing with the Open-Source-LDAT in his post Linux latency measurements and compositor tuning, also concluding that XWayland should be avoided.