I've never seen a price on the smaller one, but they looked a little spendy. Are the pontoons deflatable (so you can roll 'em up)? That's important for portability.
It is important to match your budget with the frequency of use. Don't spend too much on something you won't use very much, and vice versa.
I have an Outcast PAC-8. It's OK. I like it because it's light and easy to transport. If I had to do it all over again, I'd save up for the Outdoor Enginnering boat. Those things are indestructable.