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Well each of them have their own perks - Gold if you want to entrust some funds into an asset which is going to always be above all currencies. I would suggest you to to with SGBs or physical bricks or coins (If you want to see the bling) - Stocks if you have a limited corpose which you need to get back in a couple of years. You can start with the basic Nifty 50 index investments to distribute your funds across the top 50 companies - Commerical real-estates get you a higher rental yield or resale value but they require a larger corpus so if you have that then you can make a definite asset out of it. - Cryptocurrencies bear higher risk but can give you a higher return too but as long as you bear only 10% of your total investment portfolio on it then you are good also as long as you only can bear the risk of loosing a decent chunk of it when the global market drops. Always invest in bluechip cryptocurrencies primarily BTC, LTC, ETH etc.

Stock if you spend some time learning the market. If you have lot of money then go for real estate

My answer is stocks