I honestly prefer non-comm systems. Use a good bluetooth connector (I use a cheap APEKX and it cuts the wind noise fine if I put it inside the helmet, near my mouth) and something like mipeace/plugfones (they look the exact same blue/yellow). You can then use the app 'The CREW' and chat with others. It uses your phone's cell connection, so you'll need signal, but for the vast majority of us, we'll always be within range. You will have to convince your buddies to use the app as well, but they can by pairing their device to their phone without issue.

If you absolutely can't convince them to use an app, my experience is that cardo is better than sena. I don't have any experience with other brands.