I'm working on integrating a shipping solution into a Rails ecommerce app. We're only going to use one shipping provider. So the question is: FedEx or UPS?

I'm wondering what Rails developers think about the tech side of this question.

What do you think about the APIs, ease of integration, focus on developer's needs between FedEx and UPS?

I was leaning towards FedEx, but from looking at the developers resources sections of both sites, it seems that UPS might be more developer friendly.

Also, I'm going to be using Shopify's active_shipping gem: http://github.com/Shopify/active_shipping

And I also based my app off the Spree Ecommerce solution, but I don't think that's particularly relevant to the question. Spree wrote a wrapper to integrate active_shipping with the Spree system.

Thanks.