I believe the 20 is the new replacement for the 10 I have the smh10 and think it's great it pairs with 3 other head sets with good range and battery life with ongoing software updates every few months it gets better with the updates I use it for my music and phone and sat nav all clear as day, I believe the 20 also has a radio but basically if money is no object the 20 being new will have some extra features more pairings to riders and so on but you can pick up some good deals on the 10 at the moment, there is a review of the 20 on you tube which may help good luck.