Hi Richard,
I don't have any evidence of the impact of statistics on the differences between the 2 pbls.
My understand is that any of then full PBLs will provide you a broad view of what metrics are available to you out of the box metrics. If you don't have a large environment with a lot of agents producing a lot of metrics it will be ok.
One of the first thing we will recommend to our customers if they need to reduce metrics is use the typical vs the full. If you use the typical you can see what metrics are not available and then only add back the ones that are important to you.
Another best practice is keep metric between 2000 and 4000 metrics per agent. This is not always possible but a good rule of thumb.
Norris