Since you only mentioned ETH, I'd recommend MetaMask. I prefer this app because of its excellent multi-platform support. Plus, it's not heavy on resources. As for Phantom, I haven't tried it yet, but I've just read a few articles online, and generally, Phantom is a wallet for Solana and possibly Polygon too, so it's more multi-coin or perhaps multi-chain.
As long as you only need ETH, MetaMask is still sufficient for storing your ETH assets and ERC-20 tokens.