p.s. Coinomi is closed-source, but who is really going to review their code?
anybody who cares a tiny bit about their security and privacy.
any of the open source and semi-popular to popular wallets that you check have gotten active contributions from at least a couple of dozen developers and have been reviewed by a lot more whether a complete review or partial.
for example i myself have one through the code of bitcoin core and electrum both of which i have used and trust.
meanwhile nobody has any clue what Coinomi does and that is a serious danger to your security and privacy both.
Additionally,
1. You can choose to trust other people (who's more likely being honest/neutral) who have reviewed the source code if you can't do it yourself
2. Anyone can hire professional to audit source code of the wallet. Monero community often do this and the result is available publicly even though they usually audit their cryptocurrency protocol / implementation rather than wallet source code.
meanwhile nobody has any clue what Coinomi does and that is a serious danger to your security and privacy both.
Serious danger? Your privacy is pretty much nonexistent when you closed-source wallet, since you're connected to their server and it's likely they log everything (where there's no way to prove it's true or false).