Which is best? I guess that all depends on where they will live, your rainfall (if outdoors), and budget.
P. afra will grow in just about anything. Even heard of guys growing cuttings in strait Osmocote time release fertilizer pellets.
My biggest concern with P. Afra is avoiding root rot.
My area has two 'wet seasons' per year. Nevertheless, when they're living outside during the warmer months, anything that holds too much water is asking for trouble.
1-3 inches of rain per week is great for the garden, but not my dwarf jades.
I've had success with Adam Lavigne's 'supermix' from American Bonsai. Works great if you want 'ready to use', but only available in #30 screen.
He's got a blog where he tells you what's in it and, more importantly, why.
https://adamaskwhy.com/2017/01/27/i-feel-so-soiled/
Alternately, I use a homebrew using locally available materials:
30% lava
30% pumice
30% crushed granite (chicken grit) <or> washed pea gravel ( clean, jasper gravel from local rivers)
15% pine bark <or> Composted Horse Manure <or> Miracle Grow Succulent Soil
Numbers are kinda rough. It's more like 1 part ea. of the first three + 1/2 part of the organic.
The composted manure is the most economical, and not too hot (high N).