I have the Strata III. The Storm is a bigger sub than the Strata. That depends though on what improvements have been made to the Strata over the years. My advice is to call Rel and ask them.
I had the Stata II and upgraded to the Stata III. The Strata III is about as poweful as the orig. Storm, but I still don't think it loads a room quite as good as the orig. Storm. The great thing about the Strata III, compared to the orig. Storm, is the ability to have different crossover settings for the speaker level and line level inputs (works great in my combo HT/2-channel setup).
I think the Storm is ported, whereas the Strata is sealed. I tried both independently but not together. I think the Storm was more extended, but not as tight as the Strata.
PS: I have read other comments like Redkiwi's. I have also tried both. The Storm tightens up considerably if you upgrade the stock computer grade power cord that comes with it. (Yes is does have the IEC power cord connection.) I bought the Storm III
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