If you believe in crypto, you can't go wrong with either one, one advantage of their stock is that you can invest through traditional means.
This is by no means a GREAT way to do it, just the best option currently if you are looking at crypto from a US based brokerage account.
So this is basically 100% speculation, because you can't even use the crypto you "purchase"? You're just hoping for prices to go up. How does that make sense for a purported currency? If people aren't using it, what is the value?
If you believe in crypto, why would you invest in a centralized exchange? Seems antithetical to the principles of cryptocurrencies.
For me the most important aspect of decentralized assets is separation between money and state; challenging government monopoly power over money.
That said, there are conveniences and advantages to centralization. Centralized exchanges help supply and demand meet quickly and efficiently.
I think its possible for those systems to live together productively. There is freedom when I choose to trust and consent to other willing parties to take control of my assets. The problem arises when we are compelled to give up control by force of law.