Personally I invest directly in Tron's native token TRX. We use it to run all transactions on Tron chain that is the 5th in popularity among Blockchains.
Also I have BTC on my Tronlink. As I know, it is not real Bitcoin, it is also TRC 20 with the name Bitcoin, but it is the most comfortable way for me to invest in BTC now, I can do it  through this wallet.
Also I have seen one token called NFT. I want to investigate it and buy as well, as nowadays there is a hype around NFT, so investing in this sphere might be a profitable decision.