The best DSS is one that gives you the highest likelihood of achieving your desired outcomes :) 

As to where to get one... either you have to build it yourself, or you could hire a decision support specialist...

If building it yourself, it certainly helps to have a good chunk of data to be able to backtest the decision rules.

i.e. answer the question "if I had followed this system in the past, what would the outcomes have been?" if you have data with which to do this, you can then iterate on and tweak the DSS. 

Here's a link to a presentation I gave at the Climate Predictions and Diagnostics workshop last year that might help shed additional light on this!  

https://www.weather.gov/media/climateservices/CPASW/2024/Wednesday/2-We…