"Most accurate" will be 100% bias answer really.
Engine logics in Houston swears by their Dyno Dynamics as been the most accurate, where other shops you Dyno Jet. I believe Uprev in Austin uses Dyno Jet to do their tuning on, so in the end it really only matters for a base v. upgrade.
Really what the dyno is about is seeing your car progress, you want to find a good shop, with a solid dyno, giving accurate numbers consistently which you can use throughout the time you upgrade your car. This way you can track your car and know if there are any problems, issues, etc. by adding X part.
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