Okay, so I've been thinking about this: According to Parax reasoning, which is "If the game lags for everyone the same on standardized hardware, it's allowed." We should allow S1GBA for competition.
First off, we have Sonic 1 and Sonic 1 2013 as charts. S1-13 looks like a different enough game to warrant different and other charts.
Now, why does S1GBA not have different charts? My arguments:
1) It has anniversary and classic mode, in which sonic may or may not use spindash.
2) The Physics are completely different compared to sonic 1, there is no spike glitch, the maps look a little more compressed, you can hit the final zone boss twice (!!) when he comes out of the woodwork.
3) It has a different game-feel overall, different tricks, there are no possible zips. The Level Select does not allow you to go to specific levels or special stages, just the beginning of a zone.
Charts that I think should be included:
Anniversary mode - Times
Anniversary mode - Rings
Classic mode - Times
Classic mode - Rings
(Special Stages - rings)
The reason why I don't think special stages should be included, is because they go TOO fast, but that might be just me and others could have a different opinion on this.
EDIT: Because I was in an IRL hurry before creating this post, let me add this now: Scores are unreliable because not all enemies spawn at every stage of the game. I've encountered many enemies that spawned at some instances but not in others (mostly in labyrinth zone, the laggiest zone of the game).