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Here is an article from Sound on Sound on the difference between convolution reverbs.
And if you're a Mac user, there's always Logic Pro ($199, Mac App Store) and Space Designer -- I'm not a Logic user (in fact, I rather loather having to use it... but that's another discussion) but I've long loved Space Designer and place a much higher value on it than TLSpace, Alitverb or IR. The only issue is jumping through hoops to be able to use Space Designer in other applications. Please, Apple make Audio Unit versions of Logic Plugins. (Or make Logic useable. Either one.)