Its strange that unlike F1, the era's we best associate with great Sportscar teams and races are the ones with the strongest manaufacture presence, the late 60's when Ford spared no expense with the GT40 to rattle enzos cage, then when that era ended after Porsche, Ferrari, Alfa, Ford, Matra etc all had a turn at being best, Sportscar went into decline thur the 70's during which F1 started to grow into the monster it has now become.
We then had a wonderful time again with works teams from Porsche, Jag, Lancia, Merc, Nissan, Toyota etc all running in Grp C before it went tits up and since then dispite some brief returns with GT1's in the late 90's nothing to match them.
I guess works team should keep out of F1, leave that to the specialist small teams and stick to sportcars where they can promote there Brand without it being swamped in a wave of Shumi fever where most members of the public are not looking at what he drives but what he wears orhis latest hair care product.
Brundle against Senna in F3, Brundle could I think run with him from time to time, but was never on his level, and their respective F1 careers proved who could drive faster.
That does not change the fact that I think senna was a twat and did more to damage racing and created the racing ethos perfected by Schmacher. They where both however bloody fast drivers.