By far the most stable canoe we've ever had is a 17' coleman;  they used to have an ad where their canoe fell off a moving car and pretty much folded in half when it hit the highway........one of those.  They came in green and red.
Been kicking myself ever since the day after I sold ours.*  No idea why they stopped making them.  Indestructible, pretty much flat bottomed, easy to row, nice wide beam and reasonably light to carry.  We had 3 adults comfortably fly fishing in ours once.
Now we have a Cdntire fibreglass one;  the phrase, "tippycanoe" comes to mind, but we're spoiled after the coleman.

Granted, they weren't the canoe you wanted for shooting rapids or portaging, but I woo'd my wife while we were dating by setting the coleman on a chunk of gas pipe with a 14" bycicle tire bolted on each end and taking it filled with our camping gear and her to high mountain lakes.....but that's another story. 

Psst..........wanna buy a fibreglass canoe in new condition???

*A young fellow showed up who was wanting to woo his girlfriend with some back country camping/fishing, how could I refuse?