Optimization with non-zero spend vs all spend

[slavakx]

Hi,

I hope you can solve my dilemma here:

There are two ways to calculate average spend per channel: using all data including zero spend and calculating non-zero spend only
Both ways will lead to different averages and as a consequence different budget optimization results.
I paid attention that Robyn is using a non-zero spend for optimization while LightweightMMM is using all data
So my question is what are pros and cons of both approaches? What are the best practices?
Thanks