It's not like none of the online wallets have no security, but a few ones are good. And I don't remember where I said this, but it's your awareness and IQ based on which you get scammed or not (except for cases where any hacks take place). But you can also save yourselves from any hacks or malware with a little more "awareness" I talked about. Like for eg.; my experience with Electrum had been the best and will always be because I know whom should I trust here - their official website. There were issues with their wallet with version 3.3.3 or older that when I opened the wallet once, it asked me to download the latest update but it was a malicious attack. It was my choice to close the wallet immediately and not follow the given instructions in that pop up. After that, I just visited the official website, saw the header that said that versions older than 3.3.4 are vulnerable to phishing attacks. You really need to work with awakened eyes here if you're serious about your money. @OP, I guess you got your answer from my end - Electrum.