If I owned a BMW, I might be more concerned. As owner of an economy car, not a good target for professional thieves. Technically speaking, both key fobs can be cloned if you have the tools for it.
If I was interested in stealing a car, I know which one I would pick for best financial gain. Different risk/reward ratio, same jail time for either car.
I question the judgement of stealing an i3 though. You can pick up good low mileage used ones for 15K. I'd bet they didn't know what it was worth, just assumed the BMW logo was good enough for some value. Not even worth parting out.
2018 Kia LX HEV Metal Stream with Advanced Tech