I was told I should have data logging capability for my first electric (pattern) plane, and am wondering what I need or what would be sufficient.

I was looking at the Phoenix ICE HV ESC with data logging; it can log 4.5 minutes at 10 samples/second, or 40 minutes at 1 sample/second. Is this enough? My other thought was to get the Phoenix HV controller and an Eagletree logger, which has a much larger memory than the CC controller; however it is an extra device/connection and of course more $$$.

So what am I looking for, and how much data do I need? I have a Watt meter for measuring on the ground.

Thanks!