Different markets
Gold is held by individuals, institutions and central banks, and used in jewellery and industry. Silver has a large industrial use alongside investment and jewellery demand. Those differences can shape prices, but they do not give a dependable forecast for either metal.
Practical points
For the same value, silver takes up more room than gold, so weight, postage and storage can matter more. Smaller pieces make it easier to sell a little at a time, though they can carry a higher premium for the metal inside.
Tax depends on the product
Investment gold is not subject to VAT, whereas physical silver generally is. A Royal Mint coin with a face value can be free of Capital Gains Tax for UK residents. Never assume all coins and bars are treated alike, and take advice on your own position.
Keep expectations modest
Neither metal pays interest or dividends. Both can fall in price, and silver can swing a lot. Think about your wider finances and whether you can hold through changing markets, and take independent financial advice if you need it.
