I believe this depends a lot on the tracks themselves that are being mixed together, if there's a perfect smooth melodic transition between two average tracks it won't feel any special
I don't think I have like a favorite one, at least I can't think of any without checking some stuff again. overall I really enjoyed Markus Schulz mix compilations from mid 00s, Ibiza '06 and Amsterdam' 08 had a lot of amazing smooth transitions between amazing records, the Amsterdam '08 one won the best Countinuous DJ Mix award on DJ Mag or something if I'm correct.