With anything there is always a plus and a minus and pontoons are no exception.
Frameless - lighter, easy to set up, fits in any trunk, there are what they are ie: a 1 man pontoon can only be a 1 man pontoon
Frame types- longer set ups, heavy, will fit in a trunk if you don't mind the lid being open, can be easily modified ie: side by side seating. bimini tops, bigger motors, front steering capabilities. The list goes on.
I suggest go big and with a frame your ability to fish more bodies of water in comfort and safety will out way the minus's.