I realize this isn't the answer you are probably looking for but the "best workflow" is the one that works for you and your team. The one thing I will say is the the best ones are those that are kept as simple as possible and still meet your needs. Extra statuses and complex transitions just slow down your team. So a To Do <> In Progress <> Done using the "All" transition for each status is about as simple as it gets. Ask yourself what do you really need to report on as far as statuses go. For example, if an issue is "In Progress" do you really need to know or report on whether it is in progress under development or in progress under test. If you do then maybe To Do <> In Development <> In Test <> Done is required.
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