Err surely it all depends on what sort of riding we are talking about?
Out in the Alps dual ply 2.5 super tacky minion on the front and 2.5 60a high roller in the back has always worked for me. Survived a week at mega with not a single puncture and still managed to hold station on the climbs so all in all a result.
But would i pop them on the (enduro) for a day on the W2? no chance, it would take my weedy leg power even longer to drag myself round on those things. In winter 60a 2.35 single ply minion on the front and the same but high roller on the back is a good wet weather slow-rolling-loads-of-grip-but-gets-you-round option.
But then its still slow on the climbs really. I've been running 2.35 ardents front and rear for over a year now and rate this as a good middle ground. Better than Kenda's or Fat Alberts of similar spec. Never ridden the conti's so can't comment. The Ardents are a big profile so if you stuff up a line through a rock garden you're going to come out the other side just fine. Grip is fine, rolling speed perfectly acceptable etc etc
Its still not a fast rolling setup like crossmarks or something but then i chuck my toys because the front end gives me no grip whatsoever.
whats your point caller? I don't know really, its all personal preference and you need to think about what kind of riding people are referring to when making recommendations.
PS – >deep breath< I hate nobby nics and don't understand all you guys who rave about them ;)