For planning investment strategy you should make your portfolio diversified.
Bitcoin is a real gold but certain Silver are in the market.
Bitcoin is Number 1
2. Litecoin: faster block generation rate and faster transaction confirmation.
3. Etherium: Decentralized software platform that enable smart contracts
4. Ripple: real time global settlement network that offer instant, low cost payment.
5. Zcash: open source crypto launched in 2016.
6. Dash (Originally known as darkcoin) more secretive version of bitcoin (as per sources)