First why do you want a boat? What do you plan to use it for - cruising, fishing, skiing or ? Where do you plan to use it - lakes, river, bay ocean?? You need to know those things before you settle on a specific boat.
I personally would not rent a pontoon boat as my first boat. Yes they are easy to drive and fairly maneuverable in calm conditions. But if you drive one on a windy day for the first time with no prior experience it may be a nightmare. Docking one or maneuvering one into a slip in the wind ain’t no fun. Can be very difficult. Maneuvering around other boats, objects and driving in narrow channels in the wind can be quite challenging. And if you are dealing with currents or tidal flow along with wind it will be a bad day. On a day without wind or very little wind no problem, great boat to learn and practice on.