well there was an active and powerful organization behind BCH and that is what was (and still is) driving its price.
With BTG there is nothing like that, the devs were even struggling to even go live with their product.
So I think that while you can safely assume BCH price will go up in par with bitcoin, then it is best to exchange your BTG to something else. But it is my thinking only
There is no safe Harbour for no coin these days. BCH included (to my joy).
On top of that -as I said many times before- it was a clear danger having Korean exchanges as the predominant ones for BTG (for any kind of coin I guess it is clear by now). Doomsday has come.
ETH, XRP, BCH, BTG and many Others fell down at the sheer notice that Korean exchanges were required to comply to KYC requirements. Guess why?
Also BTC fell, albeit to a lesser extent up to now.
At writing time...
XRP -33.72% (hooray)
BTG --29.77% (I told you BTG devs)
ETH -26.98% (failure to break over 1.400USD consistently)
BCH -26.65% (joy)
BTC -19,16% (I'm still well above stop loss triggering)
For BTG: 18, 26 and 58 day support lines are in negative slope. I won't even feel like talking about the FIB Retracements which show an almighty punishment since the low of 12-10 of 2017.