All three seems to have very low jitter.
Indeed.
You've got the signal level for each: worst cases of Jitter spikes all land below the -140dB territory (assuming level is -4 8dB at minimum, you get -135dB Jitter in worst case scenario).
A bit surprised by the performance of the Douk U2, considering the complexity of its board, it still shows the "worst" results, with the most side peaks, tests after tests (yet nothing audible at this point).