We like FETH (Fidelity Advantage Ether ETF), but it is somewhat small ($70M in AUM), although its MER is relatively low at 0.53%, and it custodies the ETH in-house. We also like ETHX.B (CI Galaxy Ethereum ETF), it has a higher MER of 0.70%, but also much better liquidity ($685M AUM).
We would give ETHX.B the slight edge due to its higher AUM, but we do like Fidelity's strategy better, and it has a slightly lower MER.
Authors of this answer, directors, partners and/or officers of 5i Research and/or affiliated companies have a financial or other interest in ETHX.B.