Google search brings up some articles on this topic, but they can be biased, so:
What are the advantages and disadvantages of buying physical gold vs. investing in a gold ETF like GLD, IAU, or SGOL?
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Owning physical gold (assuming coins):
Owning gold through a fund:
If you want to speculate on gold price you should always buy an ETF/ETC (Exchange Traded Commodity). The reasons are simple:
Easy to buy and sell (one mouse click)
Cheap to buy and sell (small bank commission), compared to buying real gold (always 6 to 12% commission to the local shop when you buy and when you sell), see this one it's one cheap gold buy/sell shop I found on the internet
But if you sometimes feel that you might one day lose everything due to a major economy collapse event (like an Armageddon), or not to have enough money in bad periods or during retirement, and it makes you feel better to know you buried 999 Gold Sovereign in your house backyard (along with a rifle as suggested in comments), then just buy them and live a happy life (as long as you hide your gold in good ways and draw a good treasure map).