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I went with the Vargas turbos, but it was a tough decision between those and the Kratos turbos. The Kratos turbos are more expensive, but they do have some unique features. For me in the end there wasn't enough data running 91 and/or 93 without meth or E85 to make the extra leap in cost to Kratos, and they have no history yet good or bad. I'm sure at some point that data will be out there. For now I would put Kratos in the I'm going all out with a built motor and E85 camp (I know that's not where they put themselves, but it's my opinion), where VTT is great for straight pump gas and is good for E85, but will not make what Kratos does. We'll see what their GC+ does. All the hybrid versions out there have +/- as well, but all generally make more backpressure in the manifold, but are still great options. I would also look at spool characteristics. The VT spool very quickly, pure SG2 is somewhere in the middle and Kratos and Stage2+ are on the slower side (but make more up top).