Investing in cryptocurrencies depends on several factors, including your financial strategy, the amount of risk you accept, and your knowledge of the market. Here are some tips that may help you make the decision:

Old coins (large and relatively stable):

1. Bitcoin: It is considered the oldest and most stable in the market. It is often called “digital gold” and is known for its high value over the long term.

2. Ethereum: The second largest currency after Bitcoin, it is used in developing smart contracts and decentralized applications. Its future looks promising thanks to its continuous technological development.

3. Litecoin: Similar to Bitcoin but faster in transactions. A good option for people who want to diversify.

New currencies:

1. Solana: A relatively new currency that aims to improve the speed and efficiency of digital transactions. It has quickly gained popularity and could be promising in the future.

2. Polkadot: Focuses on facilitating interaction between different cryptocurrency networks. It is considered one of the promising projects that aim to improve the blockchain infrastructure.

3. Cardano: A science-based project that aims to provide solutions to problems faced by traditional currencies, such as infrastructure and energy costs.

Investing in old currencies:

- Advantages: More stable, has a long record of good performance.

- Disadvantages: The return may be lower compared to new currencies.

Investing in new currencies:

- Advantages: It can achieve large returns if the projects are successful.

- Disadvantages: Higher risks, and it may be difficult to predict its future performance.

Conclusion:

If you are looking for a long-term, stable investment, older coins like Bitcoin and Ethereum might be a better option. However, if you are willing to take higher risks for the chance of great returns, some of the newer coins like Solana or Polkadot might be interesting.