Torque and performance are not interchangeable terms. Performance depends on a number of factors, only one of which is torque. Some saws have high enough torque that if forced into the cut the clutch will slip before the engine bogs. Would this be good low end performance? Though a saw can be dragged down further without stalling, and although it is cutting slower, would this be good low end performance.
you could ask which saw is best for milling; one with a torque curve biased to lower rpm or higher. Which saw will cut faster in16 inch or smaller wood. Which will handle longer bars better. Or you could ask, If I want to run dull chain and make the saw labour, will I be better off with a saw that develops max power at a lower rpm.
You did not mention what size category of Stihl / Husky saws you were asking had "better" low end torque. I think dyno tests would show that there is not a consistant pattern.
To get a good answer you have to ask a definitive question!