Of the locally available I have tried, the PSN tastes the best...and waddaya know...It's also the cheapest per gram of protein compared to many others...
The chocolate varieties are super nom...and 1kg can frequently be found for as little as R140...Link below assumes the "regular" price/kg of about R220...where it is STILL the cheapest.
(https://docs.google.com/spreadsheets/d/1aINm_Uo9LH-IPKIdYgFyBRCvQegOJIExBttp5AB90zQ/edit?usp=sharing) - Updated for anyone to access.
Bought USN, Nutritech and Extreme 100% Clear before and all are overly sweet and do NOT make for good "pudding" when mixed with yoghurt and let to set.
Use it or loose it, it was a fun tiny analysis to do.
Not alwys is the cheapest option per gram of powder, the cheapest per gram of protein.
Also...if you want collagen, just get animal gelatin from Shoprite and save yourself many hundred randellas.