I have an opportunity to trade a guitar amp I am no longer using for either of these two basses. I currently play a Lakland Skyline Joe Osborn that I bought from a fellow TB'er and I love it—it's my only bass and will likely remain my main bass for a long time. I am just looking for a backup bass with a slightly different sound to play around with. Both are in excellent condition. I can play the MM4, but I don't have the opportunity to play the Sting. I realize these are WAY different options, and the MM4 will likely be similar to my JO. However, I am looking for opinions on playability and any issues I may run into with either model. Both are early 2000s models. I play through a Markbass Little Rocker 500 into an Avatar B210 cab. Thanks!