I think the one on the bottom right actually looks like it could be the easiest from a manufacturing standpoint. That part could probably be very easily made from a single piece of sheet metal that was stamped/cut and then rolled into shape. In fact if you made the ends an even radius (pill shape) it would be very easy and the least # of bends to build the part.
Sometimes if you’re thinking about making something like this that really needs to exist at a commodity level, thinking on how to remove some of those additional manufacturing steps is key.