It's been a long time since the original announcement, but I'm quite hyped to see that Retro-bit finally released their Saturn Pro Controller.
Yes, it looks a bit cramped, but I think it's the only controller in the market with 6 face buttons, 4 shoulder buttons and 2 analog sticks (the Duke comes close, but only has 2 shoulder buttons).
This should work pretty well as a controller that works with (almost) all retro games. So even if it's not as comfortable, it still sounds like a great pick.
Sharing in case someone else was also looking for something like this.