Or is that another troll?
Difficult to say on here!
Though he does sort of have a bit of a point if you have a lazy FS style. My mates on FS were pulling away on some bits where they could just sit and pedal.... but that was mostly because I was stuck behind them and couldn't carry speed from pumping. Also on a HT I tend to put in bursts of big gear pedal stokes then carry speed, where as the FS boys tend to just sit and spin at a more even pace.
actually faster on my downhill bike as I could stay seated for the whole trail and pedal through it all, very little fun though.
And unless you're racing it's definitely more about how much fun you're having surely!
Agree with all that, the downhill bike largely only goes there when my xc bike is broken as walking round is even less fun. Not saying I never stand up, quite the opposite just it's faster if you can keep pedaling and less effort if you can stay seated on the few rough bits
As for tyres anything round pumped up 10 psi more so you they don't fold over on the berms.