They are both neat toys !! I have used & owned both. They both work well especially in a car or pick-up. If you are going to use in a BIGRIGGER I would suggest getting the 2018 Xtreme it has a Noise cancelling setting. The RF is a little clearer / cleaner signal but, both have a very good sounding echo. If it were me & money was not a factor , I would get the RF limited mics. If money was an option, I would get the Superstar. Both have really good flexible cords & the echo sounds good IMO !! And I might make some folks mad but, to me the echo in both sound as good as any echo board that I have heard. The major factor to determine how good it sounds is how the operator sets it ! If the operator is witty it can be tailored to do a GREAT job!