It’s hard to make comparisons b/t the tactical differences between Strade and Roubaix because until recently we only got to see roughly the last hour of Strade, by which point the elite front and chasing groups had already formed. It certainly gave the impression that the race was mostly about who was strongest. In Roubaix, there is crucial logistical and conservation-of-energy strategy well before the final hour, regarding proper positioning (entering pave sections) and decisions about when to join groups going off the front. Maybe that’s been true at Strade too, but I’ve never had a chance to see it!