I have to agree with a lot and disagree with a lot..
on a bike , car etc, with gears, the power band may make a difference.. But on a sled with CVT tranny, it will not IMO. not saying that revving to 10k is good.. but when you are cruising you really have no power on hand, just the cruise power.. so if its within 10hp or tq who cares.. now if you nail it and it quickly jumps up to its desired torque band, then it shouldn't matter what rpm it actually is.. yes a lower rpm helps motor life, usually more low end torque etc.. But you are only seeing this for a split second.. Once up to that rpm.. then the HP starts to take over as it reaches the desired WOT rpm..
So basically, if clutched and geared correctly, they may run side by. I like rpm if its reliable.