Depends on the complexity of what you require. I know I might get down-voted for this, but if your task is relatively simple, then roll your own using deep learning. Message me if you want help with this.
I wouldn't rely on either for my own startup, because I dont think these API's will have broad appeal, as a result wont get traction, and will be shutdown with little warning.
I could help you if you want - my email is in my profile
I've had a surprising amount of success rolling my own deep learning vision system too since the community is so open, but I wanted to learn about the field and I've sunk a few weeks of spare time into it at this point so I'm not sure I'd really recommend it to a startup unless the API offerings just don't work for them for performance or cost reasons.
I wouldn't rely on either for my own startup, because I dont think these API's will have broad appeal, as a result wont get traction, and will be shutdown with little warning.
I could help you if you want - my email is in my profile