Re: would like pontoon boat feedback
I'm with crb475 and what he said. Where are you going to have your boat? At 20 or 22 ft and 8 ft wide, you won't want to be trailering it around. Even a 16 ft pontoon boat is a hassle to trailer around. If your home lake is 300 acres and everyone else putters around, you don't want to be the maniac with the racing pontoon. On the other hand if it's a big lake and people go fast, you may want to do the same (although, as noted below, a fast pontoon boat is not going to get the mileage of a runabout). Are you going to be tubing?
Pontoon boats have a low top speed unless really overpowered. Put a 60 on it and it'll go 20 something mph. Put a 90 on it and it'll go 20 something mph plus one, and the gas mileage will not be quite as good (and the transom will be weighed down more heavily). You may also find that zooming around on a 22 ft pontoon is not as much fun as zooming around in an 18 ft runabout. Pontoons are really meant for more leisurely cruising. Every boat has a natural cruising speed at which it feels really comfortable, and on a pontoon it's not 25 mph with the bow up, trying to put a lot of speed on a craft that weighs 1700 lbs and has 700 or 800 lbs on board, but doesn't really plane like a runabout does. Plus, as was mentioned by the others, weight is an issue, will it just be you and mom or 14 people?
I would go with the 60, myself, unless the boat is overly heavy (some pontoons come with 600 lbs of furniture on board) or you anticipate a lot of use with a lot of passengers.