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I can't comment on aesthetic design as that is purely a personal choice that has no impact on functionality, but I can point out a few technical details that should be considered if the purpose of the wheels are for a performance or practical use.
The ARC-8 is a spacer free direct fit for the E9X M3. The load rating exceeds JWL requirements and the wheels are VIA certified. They are available in 4 finishes and readily available.
Weights are as follows:
18x9.5" ET22 - 19.1lbs
18x10" ET25 - 19.95lbs
18x10.5" ET27 - 20.45lbs
The GT4 wheel requires a spacer in the rear of at least 18mm, and it is NOT certified for street use. It's sold as a race only wheel which means you do not know how it's been optimized for weight savings vs. strength. There are zero requirements for track only wheels, so we can't be sure it's an apples to apples comparison. There is no 10.5" size available in this design. It's available in one finish and is not as readily available. I'm not sure if it needs centering rings.
Weights are as follows:
18x9.5" ET25 - 21.3lbs
18x10" ET40 - 21.5lbs before 18mm spacer
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