I think you really have to determine it's function. I personally would rather have 2-2 seaters, but I have different riding styles and needs than others. I also can't fit a 4 seater in the toy hauler. Make a pros/cons list and see which one turns out longer. My kids are almost to the age where they can drive themselves so for our family of 4, my 2 seater works. We also have dirtbikes and such so no one is left out of the fun, just a different way of getting our fix! LOL.
I will get another two seater in the future. Not saying I am against 4, but again, it's really dependent on the objectives, needs and wants.
Jason