But the
flat cobbled sections are just what make the race so hard, ACF !
I'm a Belgian with Flemish roots and still I think Paris Roubaix is the hardest, the most dramatic, the most prestigious and the most entertaining one.
If you compare the two, you can notice that Flanders has climbs, with percentage, and not Roubaix but Flanders, which is as such a demanding race, also has many descent sections, in which you can recover, freewheeling. Paris-Roubaix being completely flat, has no descent between the cobbled sections - mostly in the last part of the race, which is really EXTREMELY hard -, which means that between those sections you still have to push.
I've also read some comments made by Merckx, who compared Milan Sanremo (a very underrated race) to Flanders. He said that he liked Sanremo because the route always goes straight ahead and you ride at a 50km/h speed and he hated the route of Flanders because it was so bending. In bends you slow down and you can also recover. For him, Sanremo seems harder than Flanders. Roubaix also has a route that goes straight ahead. You have one bend, that's around Valenciennes (in the old days, you had the famous bend of Wattignies, which was the key moment of the race, but the route has changed since then) and then, the race begins !
I know guys who finished both races as U23 and, believe me, they told me that after a race like Roubaix you lie down on your sofa for a couple of days, in order to recover.
Which one is more entertaining? I guess that's a matter of opinion. But personnally, I've been very disappointed by the last editions of Flanders. I've watched it since 1993 and Roubaix since 1992. These last few years, I could watch Flanders live from 2pm (Brussels time) and for 3 hours on. For the first two hours NOTHING happens. The decisive attack comes very late and in the end you could have a bunch of 30/40 riders to sprint for a second place (just like the Ardennes classics). Is that really entertaining?
In Paris-Roubaix, the top favourites are forced to ride in front from the Aremberg Trench on. The battle begins there, with 80km to go. And in the end, you can't have some many riders sprinting for a top ten place. The hierarchy is much more clearly defined.
Nah really, Paris-Roubaix is known as the Queen of Classics and deserves this nickname.