Security Cameras and Systems Recs

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For those of you who have installed exterior security cameras on your Airbnb, what brand/make/model do you recommend? Also, do you think exterior security cameras are enough or would you recommend getting indoor motion sensors? I was looking into the Nest security system which isn't yet available (getting just the indoor sensors in case someone breaks in), and it would send me notifications to my phone if it sensed anything. I wouldn't do their monthly service, but was mostly interested in their notifications that they would send me. It is very pricey so I don't know if it's really worth it. Should I just do an exterior camera?