Investing goals and objectives define this. Cryptocurrency can be invested anywhere. For example, PayPal and SoFi are not solely focused on crypto, but both provide digital assets. Furthermore, if you're looking for low-cost options, you can trade cryptocurrencies using fee-free brokerages such as Webull and Robinhood. In this case, you will not have access to the crypto-specific capabilities offered by Kraken or Gemini.

Of course, I would say definitely if as an investor you prefer it that way. There are other options as you mentioned but I know some prefer to use such exchanges. Just make sure to consider fees.