totems more suited to freeride but if you watch a few videos on youtube from crankworks/roam/follow me, you see a few dudes running totems for pure downhill and a few others running fox 36's. That said if I were to race I may consider getting another boxxer fork, just comes down to are you going to race, how serious do you want to take it, what your budget is and lastly preference. All im saying is dont be discouraged if you buy a faith and it comes with single crown forks doesn't mean that its no good.
I don't want to say your wrong because your not, but the information is a little miss guided. Having single crowns does not mean that you cant win or aren't serious about racing.
The totems are actually more of a DH fork than a freeride fork they are well known for being "the DH single crown".
You can race a totem and one of Australia's best jnr and now wc rider shaun o'connor used to use them for racing his V10 and obviously won many races.
The totems are a good single crown because of the 40mm Stanchions are a good choice as they don't flex as much and from reading they are great torsionally for stiffness too.
dual crowns tend to be stiffer due to the two points of attachment it does reduce flex however it is hard to judge a 35mm or 32mm stanchion double crown with a 40mm singles so while double crowns tend to be better it does need to be weighed up with the other measurements of the fork.
If you plan on riding dh purely or even majority of the time get a DH bike, i was in the situation where I wanted a downhill bike but i wanted something more versatile I ended up with a FR rig that was heavier than a dh bike and pedaled worse. The geo was off for dh it was purely a freeride machine and it was fun don't get me wrong but a dh bike is a much better machine. You also can use downhill bikes for freeride style stuff many guys do, Gee atherton thrashed redbull rampage on it hitting some insane lines. Set up is more important.
Tracks are rough everywhere if you are going fast.
They're actually smoother the faster you go, when you ride slower you sink into every hole and hit things more square which holds you up and makes the ride harsh, then you hit the point where youa re getting fast and you are stuck in between so while you don't fall into every hole and hit ever square edge you still get caught in them and you are hitting them harder so it becomes harsh, then you reach the point where you are fast and all of a sudden you are skipping over everything and just opening the bike up and instead of a super rough ride you get a smooth skimming ride. In my experience anyway.