No option is better than the rest. It doesn't matter. You can make a good game at any resolution. Try all 3. Prototype them. Figure out which one you like best. Every game goes through iterations. It's part of the development process.
You probably could've created 3 mockups in the time it took to type this and post it.
There is no "creator block". You have a story, setting, etc. Just start doing it.
I support this, but I'll give you some advice, if you're gonna prototype all three resolutions, do it in a way that doesn't take you ten hours. Iterate quickly to see what works and what doesn't. I would spend a bit more time on the more unique ideas however because they have probably not been given proper inspection in the past, and therefore might hide some golden opportunities.
Also, if you're going to restrict the resolution so much, at least put the HUD in the black stripes.