It looks like you're new here. If you want to get involved, click one of these buttons!
But I do think that "triple dump" rotomolded polyethylene hulls are decidedly inferior to Royalex canoe hulls.
The three layer poly hulls are considerably heavier, making a tandem canoe of that type of construction unacceptably heavy for many, perhaps a majority of users who anticipate doing any car topping or portaging at all.
They tend to deform over time. I have seen very many Old Town three layer poly canoes become hogged or rippled as they age, even with proper storage.
And they are much harder to repair or outfit since it is difficult to get anything to bond to polyethylene.