Yes the noise cancellation for London traffic seems a winner for me! The noise is loud when running outside. Can you try both and return them? I was under the impression you cannot due to health and hygienic reasons?
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Also I guess the APP go further into your ear in comparison to second gen Airpods? The latter I find very comfortable.
Yeah if noise cancelling is valuable to you then it looks like AirPods Pro might be the right choice for you. Honestly, if the Airpods Pro fit nicer in my ears, I would've definitely kept them. Not to mention that now it comes with the new Spatial Audio feature. But for working out and exercise in general, I personally prefer the ear hook design of the Powerbeats.
The two-week return policy still applies as far as I know (at least here in Australia). But double check with an Apple Store employee anyway.