I'm constantly worried about choosing right instrument because I'll soon trade volumes (20 cars). So for those who have direct experience for both instrument please share. Which one can handle 20 cars with least slippages?

PS: I'm only joking about "SOON" part. I made $75 out of ES today and so pumped up :-) But that's the plan.

Gold is more liquid, you can melt it down. WHile the rest is just paper and thus burn when you try to convert its form.....

All those Chemistry classes come in handy sometimes...

Keep in mind that 20 cars for gold is quite a bit bigger trade than 20 for Russell. I trade gold and I am usually scaling in, so I don't normally place orders this large (except by accident). I think a market order for 20 for gold during RTH would usually slip around 2 to 5 ticks (a lot of variability). I've seen some pretty nasty spikes though which could slip 20 or 30 ticks.

Both can make good trades but the Russell can be better in terms of risk management.

JuneBug 

Both can make good trades but the Russell can be better in terms of risk management.

@JuneBug

Are you referring to volatility when you say "better in terms of risk management"?