I may be biased, but I work at a competing processor called Adyen. We process payments for many of the world's leading e-commerce companies (Uber, Netflix, Spotify, FB, MSFT, etc...).

Merchants switching to Adyen from Stripe generally experience increased performance (higher authorization rates, no downtime), and more transparency into what's going on with their transactions. We've put a lot of effort recently into making our APIs and documentation more developer-friendly-- an area where we know Stripe excels.

Feel free to reach out directly if you'd like more info! eric [dot] jacobs [at] adyen [dot] com