Not even a question, welded only. Rivets get loose and leak. This is what I've done for 30 years, I know.
Am I correct in that G3 welds the flat bottoms, and rivets the V-hulls? If so do you know why?
Any experience with the G3 flat bottom or bay boats on big water and/or chop?
Any flat bottom boat is going to beat the hell out of you and out of the boat in chop. Even a 10 degree deadrise hull built for white water rivers will be harsh on a lake or salt hitting waves. That is what the deep V is for. It cuts through the wave instead of bouncing off the top.
What about a flat like this with a 15 deg deadrise? G3 Bay Boat Or is this not really considered a flat bottom?