The image above lists several of the prominent fantasy baseball commercial projections systems. My notes about methodology for each are included on the image.
The article by Mr. Cheatsheet linked below evaluated performance of each projection system for 2017 and 2018. Hopefully, a similar article will be forthcoming in a few months evaluating performance of 2019 projection systems.
The ATC and Mr. Cheatsheet system take projections from Steamer and ZiPS and blends the two. The formulas for the blending process are unknown. The idea of this is mitigation of risk. Over the long haul, the blended projections should perform in between the two systems chosen to blend.
Going into 2020, I would select one of the above referenced projection systems and then make tweaks based upon personal projections.
The greatest variable for all of these projections is playing time. Estimating that seems like a giant guess verses any systemic analysis.
A guide to the projection systems, Henry Druschel, @henrydruschel (SBNation Feb. 22, 2016);
RANKING THE ACCURACY OF LAST YEAR’S PROJECTIONS, Luke Gloekner, @mrcheatsheet (Mr. Cheatsheet Mar. 9, 2019)