I think your question depends on what your packing and how your tripping.
Are you canoeing or hiking or Kayaking?
Do you have a foolproof set of dry clothes that you can garantee (sorry can't spell it's late, I'm sick, and I'm at work) will stay dry?
Do you already have a top quilt selection or will you be buying this?
If you can make sure that you will have a set of dry clothes at all times the 3 season quilt could work.
If you are basically wearing all your clothes while paddling then I'd bring a winter TQ, make sure it is packed to stay dry if submerged in water...one dunking and you'll be glad you have it!
If you are hiking Quetico...lol...then listen to what other hikers suggest or do what you feel best...I'm not much of a hiker and have poor knowledge on the subject .
I have a similar length whitewater canoe trip in northern Quebec planned for this August and I'll be bringing my winter burrow...or JRB Katahdin. On a northern, remote, and lengthy canoe trip I like to know that if I go for a swim and all of my clothes get soaked I can always get warm with my sleep system. Last August I paddled a river in central Quebec (sure not Quetico but similar latitude) and slept in a Canadian Military winter sleeping bag and was glad I had it. There is absolutely NOTHING worse then being on a canoe trip and unable to get warm at night.
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