Hi toptec..
both the buffalo and montane are pile and pertex, and performance wise there is not much in it.. some say the montane is warmer, but versatile wise thats not always best..
if it makes any difference to you buffalo is made in GB.. i have been wearing buffalo gear for twenty years, and love it, though i am sure the montane would be very nice too...
I usually wear the buffalo mountain shirt as opposed to the special 6, the mountain shirt is often overlooked cos the s6 is the top dog, however the only real difference is the very slightly thinner pertex 5 instead of pertex 6 making it marginally less wind proof, in my opinion that makes the mountain shirt slightly more versatile.. cos invery cold conditions ihave never had any problem popping a good wicking base layer (merino or a helly) underneath..
in fact a thin merino layer keeps the shirt much fresher.. this has always performed and i do run hot..
if its a few degrees warmer wear next to skin, and ina strong biting wind i sometimes pop a buffalo windshirt over the top to achieve more protection from wind and moisture than the special 6...
i work and play in my buffalo, working outdoors year round within the Cairngorm NP.. at this time of year its the coat hung nearest the door.. i dont find the rustling an issue and wear it all day long, of course pertex is very slightly rustly, especially when new..
you could look at the buffalo fell jacket , although not as warm with the teclite pile, they have used a textured and softer, quieter equivilent to pertex with all the same excellent breathable, moisture transfering properties, something that you could again layer with the correct materials..
i have stayed warm and dry in all kinds of weather with this kit,no good though if stationery in prolonged rain, pop a shell on.. otherwise extremely versatile.. and ofcourse next to the fire pop on a cotton or wool smock/shirt to avoid holes from sparks..
other considerations are rab vapour rise.. but i love the buffalo gear, ofcourse if one manufacturer produces a better fit for you then that should sway it too, cos pile and pertex performs best with the correct fit so as to allow the pile to quickly take moisture away from your skin before it cools..
hope this is of some help
Northern ranger