They're basically the same software, Carina and Southern Stars are the same company, I think Southern Stars may have been set up to market their hardware side. I can't remember which versions support the SkyFi and SkyWire interfaces, but if you're thinking of telescope control pick a version that works with those interfaces. Sky Safari is on special from time to time, a short while ago Pro was on special for around $30, if it's still at that price grab it while you can.
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