I've used both, I'd go with the midge if you plan to do any off road riding. They are much wider than the randonneurs. I found the hood position on the randonneurs to be too narrow for me. For road riding I actually prefer a 44 nitto noodle over both of them. It is super comfortable on the hoods and in the drops.

I think for the midge bars to work well you want to set them up so you are riding in the drops most of the time. Otherwise they are sort of pointless. To do this you usually need to have some combination of high stem and lots of spacers. Look up some mountain bike setups that use them, you'll get the idea. I think if you position them as most people use normal road drops (hoods being the primary riding position), they don't work that well.