I am considering purchasing a 14-foot fiberglass hull fishing/hunting boat.  The best way that I can describe the hull shape is that if you look from the front, it kind of looks like two upside down "U's" going to a point in the center of the boat.  Then the hull tapers to a fairly flat bottom.  I don't exactly know what this hull shape is called.  Has anyone ever had this type of boat and if so, did you find it more stable for moving around in than a curved bottom or Vee hull type small boat?  From what I understand, the flatter bottom boats tend to plane well.  This one has a 25hp 2 stroke.

sounds like you are explaining a tri hull...what some old timers call a "super chine" hull. It was real popular and still is somewhat popular in recreational boats...not so much on fishing boats. They are actually very stable boats. Not alot of roll or pitch from movement inside the boat...do not lean like a normal V hull and do not SLAP like a Jon or flat bottom. This is why they were so popular for ski boats and such. They do not corner or turn as well though and have fallen somewhat out of popularity these days.

My father had a Browning Mustang Ski boat that was a tri hull. It was a nice riding boat, but you had to be careful turning in rough water unless you were at full plane ( with the front of the hull out of the water) or moving real slow...at moderate speeds the boat would sometimes catch a wave sideways and the outside hull point, the outside chine, would grab and lurch the boat real hard.

Have you ever heard anyone say always cross a wave or wake at 45 degrees? That belief actually started with these tri hull or super chine boats because of their tendency to grab water crossing the hull at any angle steeper than that...

Cobra boats still makes a super chine fishing boat...called the Sidewinder...which is actually a racing hull adapted to a fishing platform.

If the boat is relatively narrow, say under 70" in beam, then they called those cathedral hulls.  Virtually all bassboats in the early to mid-70's were made this way.  Very stable fishing platforms but they made for a wet and brutal ride when running down the lake.