The most important security tip is to be careful what you install and where from. That's more important than any security app.
I use neither any security app nor any cleaner app (I have SD Maid installed, but can't remember when I last opened it). But if you must have a security app, remember that by their nature one of those things has access to everything on your phone, so stick with brands who have legitimate business models that extend beyond phones and avoid companies like Cheetah Mobile who make their money selling their users' data to spammers.