BTC, ETH, and XMR are the only ones that matter. Some stable coins (USDC, GUSD) are okay, too.
BTC (Bitcoin) is good because it's the most widespread. If a vendor accepts crypto, odds are they accept BTC. However, the blockchain is easily traceable.
ETH (Ethereum) is good because its blockchain is far more versatile, so it can be used for other things than just crypto payments. However, it's less widely used for payments than BTC and is also easily traceable.
XMR (Monero) is excellent. It's extremely difficult to track an individual user. Your transactions are private. There are some possible attack vectors for the future, but they'd require that you be an actual target to be worthwhile. Someone that's going to track you is going to find a different way than XMR to do it. XMR isn't as widely used as the others, though, and it's also not on as many crypto exchanges. Kraken has it.
However, crypto as an investment is not a good idea. Spend your crypto.