Looking at the pricing offers one obvious answer: Samurai charges 2.3% plus $0.30, plus another $0.15 for American Express, and also charges $25/month. Stripe charges 2.9% plus $0.30, but charges no monthly fee and doesn't vary the price by card type.<p>As far as I can tell, Samurai doesn't seem to have automatic subscription handling, or if they do they don't seem to say anything about it on their features page. On the other hand, Samurai does offer the option of integrating with other merchant accounts in addition to their own, which you might care about.<p>Based on pricing alone, if you do more than about $4166/month in business, or you want to go to the effort of passing different transactions to different merchant accounts, you might save money with Samurai; otherwise you'll pay less with Stripe. Apart from that, Stripe appears to have some features that Samurai doesn't.<p>Personally, unless something changes between now and launch, I suspect we'll probably go with Stripe for Apters (<a href="http://apters.com" rel="nofollow">http://apters.com</a>), for simplicity of subscription handling if nothing else.