This all really depends on what your end goal is. If your goal is great video with just some mediocre data then the Virb is probably the better bet. Last I knew the gps is only 5hz which isn't really enough for autox.
If it's to get data that just happens to include video then checkout the Solostorm software from Petrel Data Systems. Runs on an android tablet/phone and can also be paired with gopro cameras.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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