Nothing beats #bitcoin in hand, on your own private keys. But if you're looking to invest through a retirement account, Microstrategy is a decent option. It's likely to perform similarly to Bitcoin/ETF, but it does carry the additional risk of being a fallible corporate entity. That risk may be slim, but it's worth noting. https://www.reddit.com/r/Bitcoin/comments/17ndqbp/comment/k7r7xbk/