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Electrum is an open source wallet that is quite good to use, there is a lot of development going on and security is constantly being updated. I use it for my desktop and mobile. related to definite security issues, of course it depends on how we as users, whether we use it wisely or not. because security will be vulnerable when users don't think about their own security and tend not to care about the security of their wallets. Hardware wallets can be a very appropriate recommendation for vulnerable security problems and will be the main storage for your assets.
Security is the first thing that needs to be prioritized when storing large amounts of Bitcoin. Electrum is also one of the Bitcoin wallets that can be obtained for free and is open source. Electrum is also very easy to use and can access wallets on several different devices and uses the smallest unit standard in Bitcoin (mBTC). Electrum is also very widely used by members on the forum, although some use other wallets to store Bitcoin because each member's choice depends relatively on which wallet they think is safer. Regarding security, it goes back to each user, only each individual can guarantee security depending on how much they care about the assets stored in the wallet.