Howdy!
I can only offer an opinion based upon what I personally do in the precious metals.
I consider gold as my emergency insurance, much like insuring a home, car, aircraft, Harley-Davidson Hog, etc…That is: large financial commitments.
I consider silver as my emergency funds for food, gas, medical, etc…That is: day-to-day expenses.
That being said, it is my personal opinion to hold gold bars, since there is virtually no premium and are priced at virtual spot price. These are one ounce COMEX approved names. These bars are in storage, some at Bullion Direct and others in a secure deposit box.
I hold a sizeable amount of silver. The bars are held at Bullion Direct while the coins are held in a secure place for ready access. These are in several forms: Silver Eagles, Silver Maples, Silver Libertads and ten-ounce bars.
Think about it for a moment. If you hold gold coins in your possession, for what would you possibly spend/trade? How would you get “change” in return?
Silver has always been used because it makes sense for smaller transactions.
I have also studied the silver/gold markets for several years. I entered the gold market in 2000 and the silver market in 2003. I am of the opinion that silver will outperform gold in the early stages of the coming PM Rush, as it has outperformed, to date from 2003. At some point, I will exchange a large portion of my physical silver holdings for gold, real estate, and any other undervalued appreciating hard asset that will then appreciate more than silver.
At present, in my opinion, silver is the most undervalued asset on the planet.
So in a nutshell: I see gold as a store of value for large emergencies and silver as a store of value for daily expenses and both gold and silver should be held, with a present ratio of about 1:10 (gold/silver).
All in my humble opinion and worth what it cost. 
Good luck and I am sure others will have different and various opinions…
LoneStarHog (Hog) [H]