I think the answer is embedded in your question - Braintree is a full-stack payments provider, so you don't have to go to three different vendors to get everything you need.
In fact this is one of keys to how we provide great service to our clients. We are a single source for any payments help you need, from signup to integration to processing. If you ever have an issue, our team will navigate the byzantine banking system so you don't have to.
BTW - check out my response about pricing in the thread above (tl;dr we're adding pricing to our Australian website)
Re:Braintree Launches in Australia
by jacques_chester on Thursday November 15, 2012 @02:32AM
(#4787611)
> a seemingly apparent affiliation with NAB's multi-currency merchant account.
NAB are the only Australian bank who offer multi-currency accounts.
Yes.
I checked.
No clear pricing, loads of info required to signup, monthly + transaction costs + merchant service fee, and a seemingly apparent affiliation with NAB's multi-currency merchant account.
How is this different from getting eWay, NAB and Chargify? You mention three points, integration, PCI and Support.
I've touched on integration already (ActiveMerchant). PCI - Chargify handles this (as does eWay using the token system).
So really the main point of difference is Support (and perhaps pricing, but can't be sure since it isn't transparent).