Gold Miners vs Gold Bullion
I think the main reason why miners get taken down along with everything else is correlation. A lot of money invested is quite often done via funds, indices etc. so when people withdraw their investments it affects group of companies with much less selectivity for the quality of the stocks so gold miners should recover faster as a sector as fundamentals will get stronger for them. Obviously stock pickers will come in at some point to select quality stocks taken down along with anything else. The answer to your question lies within your investment timeframe. If you plan to hold long term PM stocks are probably better as they are significantly undervalued vs bullion. They might get taken down if we have a market crash but eventually they will recover to their fair value vs bullion.
There has been some discussions going on in other threads about this too. Some additional explanations may be the hedging against miners and fleeing risky assets - political / management / production / exploration / etc. risks. In a more bearish market, you'd expect the miners to trail the bullion while in a bull market, the miners should outperform.