Hello Mat, Adrian,
We recommend to use the AdWords API for your production systems. While Google Ads API is in “beta”, you may use the new API for testing and development work in preparation for future migration. Please keep in mind that during this "beta" phase, there may be breaking changes in the Google Ads API. We're sorry for this inconvenience.
Note that Google Ads API is not going away and we are committed to it. During the "beta" phase, we will focus on delivering a much better performing Google Ads API to meet your and your customers’ needs.
Best,
Thanet, Google Ads API Team

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