We had a thread like this recently (
https://forum.cyclingnews.com/threads/most-prestigious-your-favorite-one-day-races.36838/), where I wrote this which I still stand by (although I would probably move up the Canadian races in the enjoyability ranking):
Only ranking the WT-races here.
Prestige:





Olympics, Worlds




The monuments



GW, Amstel, Strade, FW


Omloop, San Sebastian, E3

DDV, Hamburg, Bretagne, Frankfurt, Quebec, Montreal, De Panne
The Olympics is a special one to rate, because inside the cycling world it's probably not as prestigious as the monuments and Worlds, but outside the cycling world nothing comes close to Olympics. If I had to pick only one race I would win, I'd definitely take the Olympics. The Worlds has a special place and is ranked above the monuments in my opinion. The monuments aren't exactly equal in terms of prestige, but as someone else mentioned, the gap between them is too small to give them different rankings. I'd rate them as PR, Flanders, LBL, MSR and Lombardia in terms of prestige. I'm actually tempted to only give Strade two stars because of its short history, but it has quickly become both a fan and a rider favorite and the field is so strong that I think three stars is ok. I'm not too sure about the one and two star category so this is just off the top of my head.
Enjoyability:





Worlds, PR, Flanders, Strade




MSR, LBL, Omloop, E3, Amstel



Olympics, DDV, Lombardia, San Sebastian


Quebec, Montreal, Bretagne, GW

De Panne, Frankfurt, Hamburg, FW
Although Worlds is on a different course each year, and some of the races in itself admittedly aren't that great, it's still my favorite race of the season. The build up, the tension, it's just the most special race of the year. Once again I'm tempted to move Strade down one step because there's just not as much on the line as in PR, Flanders and Worlds, but it's always a magnificent race. MSR might be high up here, but I just love the slow build up before everything explodes on Poggio. The last 10 kilometres are always great. Omloop usually delivers and its place on the calendar makes it special for me. Olympics is hard to rank because of the shifting parcours, so I just kinda jammed it in there somewhere. FW I can only give one star because it's basically just a slow motion sprint, even though the last few editions have been decent.