De Ronde. Just slighly above Liege.
One of the reasons is that Vlaanderen is a week before Roubaix. The Belgian press goes nuts in the weeks before Vlaanderen. The broadcast on the day itself usually starts in the morning. 'They' even say it's like a national holiday in Flanders. Basically it's a race I'm looking forward to for months. De Kwaremont, Koppenberg, Paterberg, Muur, Bosberg....What's not to love? After that Roubaix is just a week away and it's hard to build up the same kind of enthusiasm
Liege is the ultimate bike race IMO. It's the best and most honest parcours for a one-day race possible. The guy who wins Liege is always one of the best in the world at that time. Not many races have that.