Out-of-the-box, you get more capabilities with ODM than any other rule product out there.

ODM is a proven solution. There is a lot of talk about Decision Model and Notation (DMN), making sort of this DMN flow chart format for making complex decisions. I would caution you that DMNs is still very young. My decision to make recommendations to clients around ODM is based on knowing the solution will work for our customers. Some of these other newer products out there are very immature. I always look at scalability, maintainability and the capability to handle real complex decisions.  When looking at other solutions, I always ask myself:  "Do I trust this product to make my most critical business decisions?"

Drools

My shortlist was Microsoft. There are so many bugs. It's a little bit annoying. They've gotten a lot better, but I am always a little wary about using certain application suites with them. 

JBoss Drools and FICO’s Blaze.

We looked at a lot of vendors, many open-source products.

I came in at the very end of the decision-making process and do not know who was evaluated.