Hello,
Thanks for reaching out to us.
Please note that Option 2 of the Malaga model is the most commonly used in the field. However, the other model (option 1) is another scheme that we did make our numerical solution based on the general formula of multiplying Shadow Rician probability density function (pdf) times Gamma-Gamma pdf.
Attached is a couple of papers that can be used as a reference for this work.
I hope this helps?
Warm Regards,
Saurabh Bedi.