Holy run on paragraph. I'll separate your thoughts and address them individually.
I'll fully admit that this was a good decision on Hyperkin's part. The iconic design of the SNES controller was a good thing to mold the portable at, just as many benheck forum projects have done before. That said, the RetroDuo Portable isn't a bad design either, and may actually be a bit more ergonomic.
It that's true, then you made a terrible choice. The Supaboy gets about 1.5-2.5 hours battery life, whereas the RDP gets 7-9 hours. It's a pretty massive difference.
Whoa, wait a minute. You aren't talking about a portable experience, you're talking about making a portable multiplayer console experience. I've never done that, but portable screens are meant for one person. Playing multiplayer on a single tiny LCD screen has got to be a frustrating, terrible experience. I'm sure this was the thought process that went into the RDP's design. Hyperkin meanwhile didn't consider this.
Have......you ever actually used one? It seems very weird to me to judge a controller based on its appearance rather than the far more important factor of its feel and comfort level. Of all the third party SNES controllers I've ever come across, the Super Retro Controller is the most comfortable, well designed pad out there. I've even said it rivals the OEM controllers in terms of overall excellence. I would really suggest you try using one and judge it on how it feels rather than purely on cosmetics.