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The 4 moa dot would probably be a little crisper and easier to see, the 2 MOA would be better for longer ranges, but Since your max is 100 yards, the 4moa would probably appear to be a little more circular and easier to use. (sometimes smaller dots can egg out or deform due to imperfections in your eyes) and the bigger dot will be less prone to that.
ETA
I have an Aimpoint Micro on mine with the 3.4moa dot and I've never had any trouble hitting anything I was shooting at, so I don't think the 4moa dot would limit your accuracy.
ETA
I have an Aimpoint Micro on mine with the 3.4moa dot and I've never had any trouble hitting anything I was shooting at, so I don't think the 4moa dot would limit your accuracy.