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During HPDE I use a iPhone-based system using Harry's LapTimer. It's relatively inexpensive but your going to want a 128gb phone. This app provides a lot of data that really enhances the playback experience.
The GoPro advantage I really notice is how much better you can mic (record audio) the footage. While I haven't used my iPhone X in this scenario... My iPhone 6S couldn't match how well I could use a GoPro to record audio.
Either would work. I'd think you'd buy for the long term and use that solution for the BMW event. Can you justify the added expenditure for the dedicated device?
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