Because the one using hardware would run using your graphics card while the other is being computed from your CPU.
You never knew that? Most problems with programs arise from issues with conflicting hardware. However, using pure software usually never has any conflicts and its a way to solve problems and diagnose an issue.
Keep in mind that software mode is significantly slower than hardware mode. Use hardware rendering unless it has problems. (in that case, you probably wouldn't be able to use the simulator)
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