As other say, better safe than sorry. I would think that if BTG becomes available by the time of the fork, there will be a steeper increase of BTC (ad BTG will be dumped for more BTC). So in that way, BTC might be quite "cheap" now.
Yep, the BTG seem to be the second son of the bitcoin and the BCC is the elder son, as you can see, some big exchanges like bitfinex, binance support the btg, I think it will be promising.