Thats a difficult question, maybe because its not looking at it in the right way....
What I mean by that is that both companies are quite reputable (Satrix is ABSA/Barcleys and Coronation is also well known)
Where the "devils in the detail" basically refers to what do you believe is at a discount right now,
and what will be higher in the future. For instance if you believe "Resources are undervalued" then Satrix Resi,
if you believe Emerging Markets (Russia, India, South Africa, etc) are cheap right now then you should go with
Coronation Emerging Markets fund.
Thats where the trouble really starts, what you think is cheap
I cant really tell you where to invest, those guys should be able to advise you better,
but personally I wouldnt invest in anything right now, the upside is limited at this price (but I could be wrong).
Best advise I can give if is do some homework, wait for a discount on the market (youll know when its there,
when everyone tells you NOT to buy) and once the market is at a discount again then invest in the selected fund.
Contribute every 1 or 3 months and hold for 5 years...Thats the formulae that works the best.