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It probably won't be out on the GBA for quite a while, so i would advise that you maybe get it on the PC, plus you also benefit from the brilliant speech that the GBA version doesn't have. You could get it on the GBA when it comes out as well.
Although I already own Broken Sword 1 on PSOne & PC, i still decided to get the GBA version as well, just incase i'm stuck on a train or in the car for a few hours.