If the budget is not a concern then I will choose to go with Apigee over WSA-2, but if it is then I would prefer the latter solution. Apigee is quite pricey. The price is a thorny issue as there is little room for negotiation.
Unlike WSA, Apigee does not have a partnership model, something which makes it a bit easier for companies such as ours to go with the former solution.
While I cannot comment definitively on the partnership issue, as the company has yet to get back to me, I can say that this issue and the one of the pricing are why I choose to rate the solution as a six out of ten.