Motor current vs duty cycle

I have a project in the works and I need a way to tell how much the motor is working at a given time. Would motor current or duty cycle be a better representation of this?

power= V x Amp. connect vesc via Bluetooth download app phone and see how much motor draws

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You can check this in the BLDC tool (activate sampling for real time data) only problem with doing that mobile is keeping a cord plugged in while you ride the board under load (you could use a laptop in a backpack but keeping the USB wire free from getting tangled might be tricky). The module is totally worth it, got it sent to the US in about a week and is almost plug and play (few setup steps required but went smooth for me).

I actually have the device. I decided motor current would probably be my best bet