I've heard the word discord so many times, I'm already burned out on it, and never been there or used it yet.... I think I'll pass. The people who spread it aren't the most desirable to be around. I wonder if that speaks for it's masses.
It's a tool and as such it can be used in many ways. Similarly to a hammer with which you can drive nails into wood to build something, or you can hit your fingers, bang your head, smash pumpkins...
You can join a massive group and suffer the consequences or you can make your own group for your squad. Fortunately you can only listen to one group at a time!
We've used Discord in AH during scenarios to keep the "official" channels open for instructions and reduce the distraction caused by the hullabaloo of drunken Finns. In normal flying AH vox is of less hassle although there's one advantage with Discord: There's a three seconds delay in vox because of the distance. But as said, having several voice communication apps on can cause issues unless you meticulously check the key mappings of each and every program. Voice activation can help but if you get used to it and someone talks to you through AH vox you may forget to push the tangent for answering. Plus if there's lots of activity on both medias it'll be a cacophony.