susieqz,
The answer is that there is no consensus, because fig trees will grow almost anywhere.
IMO the best potting mix should be based on your location, available material and application. I currently use a 5-1-1-1 mix (the last part is an oil absorbent fullers earth), because the ingredients are easily available, but I have tried many different mix variations with good results. I've used washed pea gravel (from Home depot) to replace the Perlite with good results, it just makes a heavier mix.
I've made a 1-1-1 mix, Coarse sand - Peat - Pea gravel, and topped it with compost, with very good results.
I always add 1 cup of Dolemite Limestone per 5 gallon of mix, Because I have been using that ratio for container grown vegetables for years with good results. Also figs are high in calcium, so container fig plants need a source available to them.
You have to decide whose advice you are going to follow and how you will be modifying the recipe for your conditions (possibly through trial and error).
<edit> From trials, I've found that a mix with a minimum of 50% pine bark mulch (sifted thru 1/2 inch hardware cloth) works every time. It can be as simple as 50% pine bark mulch and 50% Peat based potting mix (most peat based potting mixes usually have 15% Perlite).