I like Jetpack. For $39 a year you get a lot of security, lazy loading, CDN image management, daily backups, Akismet anti-spam, and more. I have it running on 5 sites and find it very stable. It doesn’t slow your site down. Things like embedded YouTube videos do, because the video is loaded before the page loads. It gets a bad rap for pages that have way too much code in the header, etc. I think it does what it’s supposed to do just fine. Plus the support is really strong. I get replies to emails in 30-60 minutes on average from tech support.