Ease of integration with other systems, Customer Experience, and flexibility. Although none of this will work if the solution is badly implemented, so quality implementation is a must, whether it is done by the vendor or by your team. Here is an article that might be useful…

We have been using ELMA BPM (http://www.elma-bpm.com/), and it also does not require programming to model and execute processes. Yes, for complicated custom features you will need additional scripts but that isn't generally a problem Plus, there are KPI management options…