If you're looking for the best built boat with a fit and finish quality that is top drawer it's North River no question. If you're looking for something measureable, check out bottom thickness.
North River uses 1/4 inch marine alloy exclusively.
You don't have to take anybody's word for it though, Talk to any sled owner you see or go to the Seattle Boat show. Find out which manufacturer has the most satified customers years AFTER THE SALE. Make your decision based on the experiences of guys who have already been "down the road" with local dealers. You'll find that some of their purcahses have left them feeling "up the crick".
Good luck Bro and I hope you enjoy your sled as much and more as I enjoy mine! TJN