Food for thought, although the weather can be inconsistent at best having lived in Alaska. Both of these designs are very capable of handling the Alaska way of life. Honestly from hunting in the bush, I never had a problem with the critters roaming around while camping in a tent, just don't pet the animals and you'll be fine. What it really boils down to is what do you want to get out of the equipment? I.e. function, protection, reliability etc.
One thing that I strongly recommend is picking up a copy of "The Milepost" it is a indispensable resource. Legendary Alaska trip planner and Alaska travel guide to the highways, roads, ferries, lodgings, recreation, sightseeing attractions and services along the Alaska Highway to and within Alaska, including Alberta, British Columbia, Northwest Territories and the Yukon. Word of caution having traversed the "Al-Can Hwy" numerous times , the worst part of the drive is that from Whitehorse, YK to the Alaska Border, the frost heaves (road displacement) are deceptive at size and depth, slow and steady wins. Also, extra Jerry Cans are a must, I highly recommend the Justrite AccuFlow™ DOT Approved 5 Gallon Gas & Flammables Type II Red Safety Can with 1" D Hose found at
http://www.northernsafety.com. Expensive yes, but well worth the investment, I own four. Recall those nasty frost heaves in the road? I hit one going roughly 75mph, and bottomed out causing my lashing in my thule carrier to snap realizing on of the aforementioned canisters, nothing but dents and scratches and no leaks!
PS. If you're driving up bring a camera, British Columbia is absolutely beautiful.
PPS. Be prepared to be annoyed at large R.v. caravans along the way whom frequently stop.... Hope this helps in your endeavor.
Jason