flat bottom railed hulls are for people who can't paddle!?!?!?!?
ha ha onslaught now begins:
From paddling a displacement and a hull with a flat bottom and rails.. it's something you just have to get used to.. big difference is secondary stability. As you lean over into it, the feeling is much more predictable and gradual. With the rail and flat hull you feel as you lean over and suddenly it feels like your balancing on the edge (which is what your doing).
A boat with edges sometimes is more desirable since you can throw it up on an edge and go 'through' a current. The flat also allows it to accelerate quickly and turn easily.
A displacement boat will deflect currents under the boat that might other wise try and flip you if it caught an edge. So this is a plus in pushy water! You'll feel like you go over things rather than through them.
Personally - I like using edges of a boat, since it allows me to edge the boat and do WHAT I want and go WHERE i want it to with a minimal amount of paddle strokes.
OH BTW: Having a flat bottom and edges requires more of you, like being more aware of the moving water, the angle of your edging, which makes setting up moves in technical water more difficult and more desirable for "advanced" boaters

. Not saying that displacement hull boaters aren't advanced.. just not as technically skilled.