I've had the "pathfinder" wagon (plastic with the seats) for the past year. At first I thought it was the only way to go because of the seat belts. I thought it was great to pull and my 18 month-old loved it! Then we began putting her 12 month-old sister in the wagon with her this past summer and the wagon became difficult to pull and steer. It began tipping around corners and we stopped using it because of safty concerns.
I ended up buying the all-terrain wagon that costs only $25 more than the pathfinder wagon at Target. I can't tell you the difference! It turns so easilly and I can't imagine it tipping. I also don't have to worry about it getting stuck on bumps in the sidewalk causing my girls get a big jerk. I thought I would miss the seats and seat belts but I really don't. My girls are loving this wagon and the high sides keep them safe. Surprisingly there's also much more room to carry things (toys or bags) because with two children in the pathfinder, any potential storage space is filled with their legs. To top everything off, ... this wagon is WAY easier to pull!!! It's a smooth pull and a smooth ride for its riders. I would definitely recommend this wagon!