Interesting perspective, thanks. Clearly today both are special races, but since specialization set in 30 years ago, it's difficult that a GT candidate risks the cobbled classics. So we don't have riders competing in the same classics. Yet Flanders-Roubaix combo arguably has the greatest appeal. Now Hinault, had he been Belgian, I have no doubt he would have won Flanders, but being French back then Roubaix was an absolute must!I think it is likely your bias. ;-)
I am not arguing that LBL is more important. But arguments can certainly be made…
LBL has the most history.
LBL is where GTs meet the monuments in the types of riders that compete for the win (Hinault who never won RVV)
When I was growing up in Belgium in the 70s, I do not remember RVV being more important. In fact, perhaps the opposite…
But that is likely my own bias. ;-)