I know it would seem dumb to have Anakin not turn to the darkside, which would end the story right there. Do you think he would have become more powerful with the light side rather than having turned to the darkside?
The power to help others is different than having the power to destroy others. So, in a sense where in a battle, would a good Anakin defeat a darkside Anakin.
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The fate of the galaxy lies with the Empire.
If Anakin did not turn to the darkside he would have kept his limbs and eventually defeated Palpatine to bring balance to the force. So would he be Stronger when good? I guess he kills him either way.
I think a Jedi Anakin with full training with all his limbs attached would become someone stronger than Yoda but not as wise. I dont think humans can live as long as yoda can. Against an evil Anakin with all limbs (not machine) would kick the sh*t out of Palpatine in a flash once he learns all Palpatines power. In an duel between the two anakins, I think the good side of the force would overcome.
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The fate of the galaxy lies with the Empire.