Why is Electrum better than Exodus? Both wallets encrypt private keys and keep them on your device. Maybe I'm wrong, but I think that most of non-custodial wallets are the same.
Electrum for me is much better than Exodus because it is a fully open-source and multi-signature wallet.
Probably you need to read this comparison between two of them,
Exodus vs. Electrum: The Full Comparison.
Exodus and Coinomi wallet are almost the same for me, but when it comes of most security features, Electrum will surely a good choice and it's focus only for Bitcoin storing.
Exactly.
Additionally, the only reason to use coinomi or exodus is that they are multicurrency. Coinomi supports more currencies.
There is no open source multi currency wallet.
That being said, it is better to stick with electrum when you need to use bitcoin. Then you look for multicurrency closed source wallets when dealing with multiple altcoins.
Exodus and coinomi are handy because they are no scam: they will not steal your coins. But you can find a lot of scam wallets out there, specially when dealing with small cap altcoins.
I use basically electrum and coinomi and ledger live app (hardware wallet multicurrency wallet)