Can you look at both of them and compare? I can't speak for the Kodiak as an owner, but we did look at them. I was not all that impressed with the materials used on the interior. But the floor plans were nice and they had nice features. We bought our 2nd Jayco HTT this year, the previous one was a Kiwi 17a (ancestor the x17z). We had it for 10 years and never had any problems with it.
Bumpy, they use something called "Alpha Ply Roofing" which is a brand name for a type of rubber roof.
http://www.all-rite.com/alpha-roofing-p-402.html