Out of curiosity, why would you want to? Other than just to say you've done it of course. Typically when I make a Linux install, it stays the same distro. The test environment being the exception to the rule.
In my experience, it comes down to performance. When you are using hardware raid, the raid processing is done by a separate hardware device. When you are using motherboard raid or software raid, all the processing is done by the CPU instead; taking away resources from other applications and...