Hi wavydavy,
The U-bass’s rubber strings sound a little bit more muted on their own, so the harmonic resonance will be a little less than the electric bass. However, due to the piezo pickup, there is a bit more string noise (clicky, scratchy sounds). This can be lessened with proper technique, but it is a bit of a learning curve. Soon I’ll be making a course that will address some of these issues. I hope this helps a bit! Let me know if you have any more questions.
Thank you,
Stephen