I would definitely go with the L170. The LX665 New Holland that I run can be a bit short on power when at the limits pushing snow and digging dirt. Traction never seems to be a problem, just power. I would be very concerned about having the non-turbo engine that the L160 uses for our needs.
Granted, I am using an older LX665 New Holland skid steer but it is essentially the same frame and horsepower as the newer L-series machines. The engines on the newer LS170 & L170 do feel more responsive. I believe that New Holland is using a wastegate turbo which spools up faster...and they sound a bit different.
We have been pleased with our New Holland. It is an early '94 machine, I believe. Every other New Holland that I have driven has controls which are considerably easier to use than ours. The foot pedals on our machine are stiff and hard to feather.
That is my two cents. Good luck with your upcoming purchase.