For me the choice was the Radmini vs the non-folding Juiced ODK. Both companies are reputable and I was interested in the utility of a "smaller" form factor with cargo capabilities, though both bikes are larger than your average 20" bike. The folding feature, torque, and the lower price were what did it for me. I wanted to be able to call an uber if I was stranded, and I have indeed used that feature. I loved the idea of fat tires when I bought it, and they are extremely comfortable and stable, but they come with their own drawbacks - weight and harder maintenance. The radmini's utilitarian looks definitely made an impression, too.The low center of gravity makes it super stable even with cargo, and the battery placement is perfect.
I think the Radwagon looks like a great bike, I gave it a lot of thought, but just didn't fall in love with it. Also, the Juiced can take an average adult passenger; that's awesome. The Radwagon is limited to children.
Never considered a Radrover, I wanted something that was more designed for utility - errands, commuting, etc.
Good luck in your search.