Assuming you made the purchases in end December 2020, you'd be better off in gold by approximately 7.5%
Rough calcs (all in AUD)
1. Gold was $2589 giving you 7.725 oz, meaning at todays spot it would be worth $25,198*
2. A200 (assuming 100% super) was 110.87 meaning 180 units, at todays current trading price it would be worth $23,427** ***
* don't recall the rules, but assume you'd have had some tax implications to extract the $20k from super
** less as your super would have had fees charged
*** if you'd managed to add to the super prior December the return would have been much better
Which option did the friend choose?