a few yrs ago ZG would have been the better choice for screen trading
now GC is far and away the king of the metals
by the way ... YG is a good choice for getting your feet wet in futures trading during daytime USA hours
as it us 1/3 the size of GC +ZG
or one can trade 100 shares of GLD ( ETF)
if you have an account that fits the pattern daytrader rules
and wish to lower your risk further while you refine your
trading style to suit these volatile conditions we are seeing
good luck to you
ps you are correct ... both are 100 OZ and $10 a tick )