Would suggest thats a pretty big question.
VERY high level:
160mm will give you
more stable at speed (slacker head angle)
more control through the rough stuff (more travel)
bike will hold its line better (stiffer left to right + weight)
stiffer front to back – only really felt under breaking
disadvantages:
might not suit your frame therefore ruin handling and/ or snap it
Weight will be a disadvantage uphill
slacker head angle could make it wandery uphill (although not if u get Talas as u suggest)
presuming your frame suits both as mine does you know if you live to enjoy the downs (160mm) or you enjoy the climbs and putting the milage in and therefore go 140mm. I have a mojo and have the very lucky option to run both, the 36 sits neglected in the garage until i go to the alps each year. then again if my mates were DH'ers i would run the 36 all year.
hope all that helps!!