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If you regularly talk bike to bike and listen to music, get the 20S. The audio multitasking feature allows you to talk and listen to music simultaneously with the music "dimming" whenever you or anyone else is speaking. It's quite nice not to have to change modes to do both. Caution: the other rider must have a 20S, too as it doesn't function correctly if they are using anything else.
If you regularly talk to multiple people while riding, the 20S can connect to 8 other 20S units. It cannot make more than 3 other SMH-10 units work with it though, at least in my experience. We couldn't make 4 SMH-10 units and a 20S work on a ride.
I'd look at the 10U
I'd look at the 10U
Love the 10u for its integration into the helmet. Can't even tell it is there.
Downside. ..the fm radio totally sucks. Reception is horrible at best.