taking some money off the table - what to sell?

[dothebeats]

Bitcoin Gold since it's not doing any substantial noise compared to the two options you've listed. BCH markets had been pretty dramatic lately, and suggests that many people are also interested in playing with it meaning you could further extend your chances on making some significant profits in keeping it. On bitcoin, it's pretty much self-explanatory. You can make profit out of it even if you just let it sit on your wallet.

[CryptoTamer]

I purchased some bitcoin back in June, so I have equal number of bitcoin, bitcoin cash and bitcoin gold.

If I'm looking to sell enough to recoup my original investment (about 20% of current value), which of the 3 would you suggest I sell?

Thanks.

First sell Bitcoin Gold because I think this coin is less desirable,the second is Bcash but it would be better if it be patient to sell Bcash because Bcash often at the pump.
If you get a good price from selling it, I think that's enough for your purpose